Lytro is one of those amazing companies that has created a new piece of technology that is wildly like nothing else. Lytro's cameras are able to take a picture that can later be refocused to any point in the image.
What does that mean? If you took a picture of someone and found out later their smile was out of focus you would be able to refocus the image so that their smile would be focused and crystal clear. No other camera can do that.
If it didn't start at $400 I'd probably snatch one up, but as it stands it looks to be more of a niche purchase. Although...
There have been whispers that Apple is interested in lytro's technology. Imagine lytro's technology in your next iPhone. How wicked would that be?