http://en.wikipedia.org/wiki/Microlens and
http://en.wikipedia.org/wiki/Plenoptic_camera one thing to remember in all the marketing spin is that point and shoots like the iphone dont have to focus much anyway because a short focal length and a small aperture create the entire image in focus instantly (see
http://dofmaster.com/doftable.html with 8mm lens and f8 aperture)