The Sugar on a Stick project gives children access to their Sugar on any computer in their environment with just a USB memory stick.A buddy of mine purchased an OLPC when they were first released. He wasn't impressed with it, but I can't say the same... Sugar on a Stick runs great on my old Eee PC 900, and is a lot more intuitive than you'd think, even for a grup!
There's a list of bundled apps -- sorry, activities on the Sugar on a Stick Wiki. I was impressed most with the fact that I could connect to my WPA-encrypted home WiFi network on the first try -- that's more than you can say for a lot of Linux distros...