The iPod Wall from welikesmall on Vimeo.
We Like Small built a wall made from 20 iPods and built an app that display photos from a library randomly across all iPhones or as a large image split between iPhones. Future releases will allow all sorts of external user interaction.
Plenty of blurb on the Vimeo site.
They’ve got a nice website too – http://www.welikesmall.com