Photo Booth, the application for snapping distorted and stylised shots using your Mac's webcam, was irrationally but undeniably a lot of fun. Camera Sutra brings that same real-time zaniness to your iPhone 4's front-facing camera.
The app takes advantage of one of iOS 4's multitudinous new APIs for live image previewing, giving you a chance to see how you and your friends' faces look stretched, twirled, dented, infrareded out and more - there are 13 effects in total - and then snap a picture of it to your camera roll.
The interface is well designed and the app works beautifully with the iPhone 4's front-facing camera, though it supports the 3G's rear camera too. If you even occasionally are inclined to silliness, it's well worth $2.49. [iTunes]