Via infogargoyle, this ultra-cool Mac Mini robot (in german, so check the english translation) :

Mini psi - in such a way our small friend is called - orients itself with one iSight and thinks with a MicroPsi Nodenetz. Three strong Servos turn a omnidirektionalen drive - thus the robot can itself, without having to change its adjustment, move in each direction.

More information on the project page. It's a project carried out by Kay Berkling, Armin Zundel, Nile Appelhans, Jessica Tin, Holger Heine, Tim Kietzmann, Roland Hafner and Ronnie Vuine.