One revolution that Leap Motion did is produced a lot of press to the short range gesture recognition for computer control. A few other companies presented their own versions of short range user interface middleware.
Here is Lubek, Germany-based Gestigon video:
Here is Erlangen, Germany-based Metrilus demo video:
Here is video from Israel-based Omek Interactive's Grasp product, specially optimized for close range gestures:
And here is one of the recent videos from Leap Motion: