Group Shot from Microsoft Research!!!
For my photographer friends:
We are happy to introduce Microsoft Research Group Shot.
MSR Group Shot helps you create a perfect group photo out a series of group photos. With Group Shot you can select your favorite parts in each shot of the series and Group Shot will automatically build a composite image.
For more info and download, point your browser to: http://research.microsoft.com/projects/GroupShot/
That is VERY cool!