Get flash to fully experience Pearltrees
Igowin is a 9x9 free version of Many Faces of Go. Play go against the computer with great graphics. It keeps track of your record and playing strength and has an on-line manual with history of go, where to buy books and equipment, etc. It includes the Go Tutorial from The Many Faces of Go, so it is a good program to give a beginning go player. It plays competitively from 25 Kyu through 6 Dan, so stronger players will enjoy it as well.