Clear, the heavily-anticipated touch-based to-do list app, is launching in the iTunes App Store tonight. And by heavily anticipated, I mean this app was getting tech blog coverage based on demos, previews and teaser videos.

Why the big draw for what’s typically been a rather ho-hum app category, the lowly to-do list? Clear is pure eye candy, for starters. But it’s also representative of a major leap forward in smartphone app design, as it’s been built from the ground up for the touch interface. The app is based solely on the use of now-common gestures: swipes, pulls and pinches. There are no buttons with Clear, and yet, it’s surprisingly simple to use. In fact, that’s the point.