Fix group pictures

Whenever taking a picture of a group of people it always seems that someone blinks, or something pops into the backgroud.

Photoshop Elements 6 has a feature to merge select portions of several pictures to get that 'right shot'

Microsoft Research has a dedicated application they give away for free:
Microsoft Research Group Shot

Here's a less polished bit of research to do similar things:
http://grail.cs.washington.edu/projects/photomontage/