Leap motion has got a product letting you control your computer in 3D space and it looks pretty cool

<a href="http://youtu.be/_d6KuiuteIA" target="_blank" class="aeva_link bbc_link new_win">http://youtu.be/_d6KuiuteIA</a>

I think flipping through photos with a client or perhaps doing a first round of pics would be pretty fun this way.  My arm might get tired if I was to edit photos the whole day though.

http://www.togtech.com/leap-motion/