Post-It Notes Shopping Genius is a price comparison gadget that will quickly find the best deals for your favourite products, and then track how those prices change over time.
Drag Shopping Genius off the sidebar (in Windows 7 or Vista), click Edit List, and search for a product you might like to buy - an iPod touch, say. In just a few seconds Shopping Genius will leverage the might of the Shopping.com database to find the lowest prices for your chosen item. Browse the list, click Add for your preferred deal, and it'll appear on the main Shopping Genius list.
If you want to buy right now, just click the item, choose a store and you'll be taken to their website, ready to order.
Wait for a day or two, though, and you'll find Shopping Genius tracks and alerts you to any price changes. So if your iPod Touch shows up in a sale somewhere, it'll be highlighted on the gadget and you'll be able to buy it immediately at the new, bargain price.