Anyone know a plugin or helper app for "photo" photo collages?

[t1redalarm]

I'm sure some of you have saw these. It's where you take hundreds of seprate pics, and tile them to become "pixles" in a larger picture. (for an example, see disney.go.com/inside/issues/stories/v050104.html)

I would like to create one and am looking for a method other than individual placement. It would even be helpful to have an app the gave the median "color" or the pictue.

Any suggestions?

Thanks,
-Daniel