Lisa Strausfeld's team at Pentagram has designed DEC 12 2006
Lisa Strausfeld's team at Pentagram has designed the interface for the One Laptop Per Child computer. "Users can move outward from the Home view, where they can set preferences like color, to the Friends view, where they can chat with their friends, to the larger Neighborhood view, where they can locate other users and gather around an activity."
Update: The OLPC human interface guidelines document has a lot more on the interface. (thx, bob)