Unique is the only one black and white, and absolutely minialistic to-do list that you'll find on the App Store. The idea of making it originally started to join Code Challenge contest, which basically stated that you should made an app or software in less than 8 hours!
Learning how to use Unique takes less than a minute. It's all about simple gestures, like dragging, swiping and touching. If you have an iPhone, give it a try! Shall I mark the contest as completed and Objective-C as mastered?