While I was in Austin, I was given a Lytro camera to try out for an evening. The Lytro site can explain much better than I can what this camera does:
The Lytro camera lets you capture and share what you see in a whole new way. It’s the first consumer camera that records the entire light field — all the rays of light traveling in every direction through a scene — instead of a flat 2D image.
This means you can refocus images and change perspective in post-processing. You can do this and export a flat image, or you can upload your photos to the Lytro site and embed them on websites, allowing viewers to focus or alter perspective they way they want.
It's an amazing idea. It's going to be incredibly useful technology when it's ready. At the moment, the photos are very low resolution and the crazy focus and perspective shifts you'll see in the example images didn't seem to happen for the photos I took. It's also pretty bad in low light. Still, it's a lot of fun, and I can't wait to see what the next few iterations bring. Also, it's fun watching people get really confused about the weird looking Start Trek type contraption you're pointing at things.
A few examples
I've embedded a few examples of mine here. Try clicking on an area to refocus. Try clicking and dragging to change perspective.