No need to sift through all the titles at the App Store – we've picked out 18 of the best, including IncrediBooth, Whole Foods, and WolframAlpha.
Audio and photo tools
Revisit the photo booth
One of the first apps to use the iPhone 4's front-facing camera, IncrediBooth gives you an almost genuine photo-booth experience (minus the shopping centre atmosphere). You get three 'retro effects', and you can share a photo strip or just one image with Facebook friends.
Make trippy photos
In Diptic you can combine two or three photos to create a cool new image. Juxtaposing a close-up of your cat with a photo of your pals has never been so addicting.
Hear new music
In Last.fm you enter the name of an artist you like, and the app recommends other artists based on your preferences. You can listen to as much music as you want, too.
Find public radio
With Public Radio Player you can hear public radio stations from all over the country. After detecting your location, the app can supply a list of the stations around you.
Entertainment apps and games
Keep it rolling
In the bizarre but fun I Love Katamari, you're a pint-size alien prince who has been ordered by the King of All Cosmos to collect objects by rolling a highly adhesive Katamari ball. You use the phone's accelerometer to control the Katamari.
Slay the undead
The Plants vs. Zombies strategy game has you defending your home from zombie invasion with an arsenal of deadly flora. Cute animation, witty humour, and addictive gameplay make this title one of the best paid games in the App Store.
Play word games
In the Scrabble-like Words With Friends you can play against buddies or strangers. The game cleverly uses push notifications to tell you to take your turn, and you can invite pals to play via social networks.
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