We've covered Leap Motion control before and from looking at the demos of it, it looks nothing short of amazing. The ability to just zip around an OS with gestures is a very neat idea, even if it is weird holding your hands up in mid air. Leap Motion is actually being put to use though, specifically with Clear for Mac. Realmac Software, the developers of Clear for Mac, have put together a video showing off Leap Motion and Clear for Mac working together. The user can simply use gestures to carry out actions in the app. You'll still need to go back to your keyboard to type stuff in though and when adding timers/reminders to your tasks.