I found this article at Mashable about a camera that takes pictures that you focus afterwards. This mad device captures all of the available information and then once you have a digital print you can play with the focus point to your hearts content.

More info on the light field camera can be found herehttp://www.lytro.com/

My mind has been blown for today. I think I need a lie down.

In the meantime you can check out an example below. Click on the image for a focus point and double click to zoom.