Some things are annoying by their nature - spam, Jim Davidson, people with massive dogs who say: 'don't worry, he won't hurt you'. But when the annoyances stem from stuff you've paid for, fur starts flying.

Unlike PC Advisor's 20 worst technologies of all time, annoying products aren't necessarily bad. They just make you think bad thoughts.

And they all have one or two traits that make you want to encase them in concrete and toss them off the side of a boat.

From stupid features and rude behaviour to brain-dead design and poor corporate policies, these 20 products have truly annoyed us over the years, and some continue to do so.

This list hardly covers every annoying tech product ever made - MBS didn't make it, for one. So if a product not listed here really got under your skin, please post a comment below. If nothing else, you might feel a little better.

1. AOL CDs (1993 to 2006)

As our number 1 worst product of all time, America Online gave all of us plenty to be irked about over many, many years. But the carpet bombing of free AOL discs was possibly the most annoying (and environmentally irresponsible) marketing campaign ever waged.

Estimates put the number of discs shipped between July 1993 and July 2006 at over 1 billion; we feel like we received that many ourselves.

2. Windows Me (2000)

Windows Me the worst version of Windows ever released. It was a mess. Shortly after its release a tidal wave of bug reports smashed into Redmond. Installation was difficult, hardware driver support was sketchy, and system crashes were routine.

As one analyst said: "If you upgraded to Me from an older version of Windows, you might feel that the term Millennium refers to the length of time it will take to fix the glitches."

3. Apple iTunes, Microsoft Windows Media Player, Microsoft Zune, Napster (2003 to present)

The media players themselves are mostly fine, but their incompatible DRM (digital rights management) schemes drive us nuts. Despite Apple's recent decision to sell some DRM-free songs, most iTunes tunes still play only on iPods, a couple of Motorola phones, or a computer with iTunes software on it. (And the DRM-free songs cost 20p more - or, er, 15p in the States. Another annoyance.)

Windows Media files are worse - now, two different, totally incompatible DRM file formats use the .wma file extension. So if you buy a WMA file from a service that uses Microsoft's PlaysForSure DRM (most notably Napster), it won't work with the Zune (which uses Microsoft's Zune DRM). Can't we all just get along?

Microsoft has said it will "soon" sell DRM-free music for the Zune. We'll see.

4. Intuit Quicken 2005 (2005)

Software companies have two ways to guarantee a software revenue stream: come up with compelling new features that entice users to upgrade each year, or take features away if they don't. Intuit chose the latter path with Quicken 2005, forcing users of older versions to pony up if they wanted to continue downloading data from their financial institutions over the Internet. Intuit QuickBooks 2007 earns a dishonorable mention as well, for forcing users to upgrade if they want to run Windows Vista.

5. Real Networks (Progressive Networks) RealPlayer (1996 to 2004)

Why RealPlayer? Mostly because it had a relentless pushiness about everything it did.

For example, in 1996 Progressive Networks (now called Real Networks) began offering RealPlayer in a pay-for Plus version and a free version, but finding the download link for the free one was like playing "Where's Waldo" on the Real.com site. Once you tracked down and installed the free player, it declared itself your default media player for all file formats and began nagging you to pony up for Plus.

Later versions installed themselves into your Windows system tray and popped up pointless (and annoying) "special offers" from Real advertisers. And, of course, Real's notorious attempts to assign unique ID numbers and track consumer media usage - anonymously or otherwise - did nothing to endear itself to us. Pay for this pioneer of pushiness? Get real.

6. Bonzi Buddy (1999-2004)

Described as a "helper" application, Bonzi Buddy delivered contextual ads to your PC, basically after collecting information from you. Its passing has not been mourned.

As reader Randy J put it to us: "I used to do support for one of the big ISPs. Bonzi Buddy was one to remember. I once used a computer with it on there. It kept popping up and obscuring things you needed to see. I had to uninstall it from many, many people's systems."

7. MySpace (2003 to present)

Gwendolyn would like to be added as one of your friends. Brittany would like to be added as one of your friends. Latisha would like you to view her free adult video, which incidentally will download spyware to your hard drive.

Sure, the biggest websites always attract scammers (see eBay), but they don't have to make it easy. MySpace's minimal barriers to entry make it a haven for bogus "friends".

8. Microsoft Windows Vista (2007)

It's one of the unwritten laws of computing: All versions of Windows are annoying. Vista wins a prize in part because of its overzealous "Cancel or Continue?" confirmation windows so brilliantly lampooned by Apple's "I'm a Mac, I'm a PC" commercials.

But that's only the tip of the Vista annoyance iceberg. Installing Vista onto an older system? There's a good chance that your graphics card, sound card and some of your older software won't work properly. And even if you have a new system with either the Premium or Ultimate version installed, Vista won't display its nifty 3D Aero interface if your PC lacks the graphics horsepower for it. No warning screens, no error messages, no explanations - Aero simply doesn't work. That's annoying.

9. Microsoft Windows Update (1998 to present)

Yes, we know, our computers would be even more vulnerable if we didn't use Update to plug Windows' seemingly endless security holes. But using it to distribute Microsoft's Windows Genuine Advantage tattleware puts Update firmly in the annoyance column (not to mention the way it autorestarts your system after it's done installing).

Delivered as a "critical" update last spring, WGA installed itself with minimal notice, secretly phoned home with information about users' systems, and wrongly identified possibly millions of legitimate copies of Windows XP as pirated.

10. Apple QuickTime for Windows (2001 to present)

What is it about media players that makes them think they own your PC? Install QuickTime, and it immediately sets up camp in your Windows system tray, drops icons on your desktop, and loads the qttask.exe applet every time you power up - no questions asked.

You can kick it out of the tray, but the next time you upgrade or reinstall the program, it sneaks back in. Worse, if you want to use iTunes, you have to take QuickTime along with it. Plenty of programs are looking for a home in your system tray, but most of them ask politely first.

11. Microsoft Office 97 (1997) and Clippy

When Microsoft Bob went to the great software boneyard in the sky, it left a little gift behind: Clippy, an oh-so-irritating animated paper clip that popped up on screen and offered inane advice for using the different Office applications. Clippy finally got clipped in 2001.

Even more annoying, though, was Office 97's lack of backward compatibility. For example, you couldn't open a Word 97 document in Word 95. After corporate users balked at Microsoft's bald-faced attempt to force them to upgrade, the company released an Office 97 service pack that allowed users to open files in either version of Word.

12. Adobe (Macromedia) Flash (1996 to present)

Adobe's animation tool, introduced by Macromedia in 1996, has arguably done more than any other product to liven up our web browsers. But it's also the dominant technology behind those running, jumping, spinning, swirling, flashing, dancing, popping, peeling, and just generally irritating rich-media web ads. We like Flash, but we wish web designers would use its power for good and not evil.

13. AOL Instant Messenger, Microsoft Windows Messenger, Yahoo Messenger (1997 to present)

So you invite a friend to stay over at your place for a while, and before you know it he has invited his half-wit cousins to camp out in your living room. That's what these chat clients are like. To get a simple program for IM-ing your friends, you also have to put up with their Webby companions (such as AIM Today and Inside Yahoo) that load at startup. They also install browser toolbars, change your home page, and toss ads in your face. With chat buddies like these, who needs enemies

14. Sony PlayStation 3 (2006)

Read our PlayStation 3 review here

More eagerly awaited than Vista and almost as disappointing, Sony's PlayStation 3 is full of minor annoyances - from buggy wireless to slow and cumbersome firmware updates (requiring a USB cable). Owners of HDTVs who expected the PS3 to enhance the look of their DVDs got a rude shock: Unlike many DVD players equipped with HDMI outputs, the PS3 doesn't upscale the disc's native 480p resolution to high-definition.

And the PS3 still has the distinction of being the only Blu-ray player that does not output movies at 720p. Instead, movies must be scaled (with varying results) to the fixed-pixel-unfriendly 1080i. Worse, problems with high-definition copy protection (HDCP) caused some PS3 titles to blink on and off on some TV sets. The most annoying thing about the PS3? Its price.

15. eBay (1995 to present)

The world's biggest auction site has many problems, but its seemingly random approach to policy enforcement is what gets our hackles up. Do something wrong when you post an item - like charge too much for shipping - and the auction police delete your item without any warning, forcing you to redo the listing from scratch. We wouldn't have an issue with this if eBay were better at policing actual scams, such as bogus listings, rampant phishing schemes, and bidding circles in which scammers artificially pump up each other's ratings. Yet by all measures, auction fraud remains Netizens' single biggest complaint. Irritating? You bet.

16. Apple Pro Mouse (2000)

In 1981, Xerox released the Star workstation, featuring a graphical interface and a two-button mouse. But Apple didn't get around to adding a second mouse button until August 2005, despite the fact that it had supported contextual menus in the Mac OS for years. This was especially infuriating when Apple released its sleek Pro Mouse in 2000: Instead of right-clicking to access contextual menus, Mac mousers had to hold down the Control key while clicking. Was this Apple's way of guaranteeing a steady stream of customers for multibutton mouse vendors like Logitech, Kensington, and Microsoft, or was it mere stubbornness? We're betting on the latter. In either case, it was annoying.

17. Plaxo (2002 to 2006)

Change the tiniest detail in your Plaxo contact profile, and everybody in your address book would receive a "Hi. I'm updating my address book. Please take a moment to update your latest contact information" email - a not-so-subtle nudge to get them to sign up for Plaxo themselves so that it would update such info without bugging anyone. Plaxo finally abandoned the practice in March 2006, saying it had accumulated enough members that spamming the world was no longer necessary. We had reached the same conclusion years earlier.

18. Microsoft Office Outlook 2003 (2003)

What do you call an email client that can't handle e-mail? Outlook 2003. Microsoft's premier email program stored all messages in a single, ever-growing data file. The more mail you got, the slower Outlook ran - until it stopped running entirely. Microsoft's solution? Autoarchive your messages, making them nearly impossible to find later or prompting annoying 'Would you like to archive your old messages now?' dialog boxes. No thanks, I'll just switch to Mozilla's free Thunderbird instead.

19. Apple Power Mac G4 Cube (2000)

Sure, the Borg-like design looked pretty darned cool. But the fanless 8in Cube was anything but cool in a literal sense. Put a pile of papers down on its top external vents, and the Cube would overheat and shut down. Worse, some Cubes shut down, hibernated, and restarted at random--over and over and over - due to loose DC-to-DC converter cards and finicky power buttons. That was most definitely uncool.

20. Harmonium (1998)

You've probably never heard of Harmonium, but you've certainly heard it at work - dozens of times a day. This software, developed by Finnish programmer Vesa-Matti "Vesku" Paananen in 1998 and distributed for free over the net, allows mobile phones to produce distinctive (one might also say cheesy) polyphonic ringtones. (Following them were master tones, which are snippets from actual songs.) The world has been a much noisier place ever since. Thanks for nothing, Vesku.