I've been following this camera's development for a while, and got a chance to play with it @ SXSWi. Fundamentally this camera captures the entire light field, and allows one to refocus the pic at any time (just click different points on the pic and see the image refocus magically). Currently only supported on Mac, but Windows to be released later this year.
http://reefbuilders.com/2012/03/14/lytro-pictures-reef-aquarium/