I hardly ever get excited after downloading something, maybe a, wow that's cool, but when I installed this (which was very easy) and it just worked, I actually clapped and said 'this is fucking awesome.'
I had the exact same feeling. You see these gesture controls in movies and demos and they seem great, but it's truly exciting when you get to use it yourself.
Thought that this was great - how about a next/previous track gesture, and being able to change the frequency that it checks for the hand? (it looks like it's time based)