I love this stuff.

A few months ago I wrote a multifocal composer in python - like HDR combines images with different exposures, this combined images with different focuses. Turned out to be easier than expected (and there are much better toolkits out there.)

The plenoptic cameras are going to change this field once someone figures out how to make them.

Some links on Computational Photography, for those who may be interested in this emerging field:

http://www.americanscientist.org/issues/pub/computational-ph...

http://stellar.mit.edu/S/course/6/sp07/6.088/index.html

http://graphics.cs.cmu.edu/courses/15-463/2005_fall/www/463....

http://www.cc.gatech.edu/classes/AY2005/cs4803cp_summer

http://graphics.stanford.edu/courses/cs448-04-spring