Adobe has made new camera lenses called Plenoptic lenses. They allow you to refocus a pictures after it has been taken. The lens is basically comprised of a bunch of tiny "sub-lenses" that allow for the increased amount of picture info to be recorded. They are supposed to be placed in between your cameras sensor and it's standard lens. The tech is still in the prototype phase though, so don't expect to see Plenoptic lens cameras at Best Buy this holiday season.
via: engadget