The Inside One Laptop Per Child: Episode 2 video is essential viewing for the ed-tech community in the US. It is a great introduction to the collaborative features of the system. Among other things, they make the point, in passing, of why educational games need to be free software. Episode 1 is pretty good too.
I'm a little frustrated that there's not more prominent, vocal and urgent support right now in the US for OLPC, but I suppose it probably doesn't make any practical difference. OLPC will succeed or fail in the developing world over the next few years (it is hard to imagine it limping along, neither succeeding or failing for a long time), and the future of educational technology in the US will be determined by process.