My children got OLPC XOs for Christmas. The first request by son William (8) was that I put DrScheme on his XO. I tried a standard build and it almost worked, but for a few missing libraries. I got on the PLT horn and very quickly Matthew Flatt, Noel Welsh and Grant Rettke offered help. Mako Hill of OLPC and FSF also pitched in. Grant has created several images that work on the XO, all of which work well. Our next task is to put a wrapper on the image to make it an Activity we can post on the OLPC wiki.