A Lytro camera uses Light Field Photography (also known as plenoptic photography) which captures all the available light in a scene going in every direction. It works by breaking up the main image with a microlens over an image sensor. (Source: Wikipedia)
Engadget had hands-on experience with this Lytro camera. Check that out for more photos and videos.
Features of a plenoptic camera include: Check out the features list »