The OLPC was originally slated to be the $100 PC but the actual production cost is somewhere around $175. I had a chance to get a test drive of the OLPC at the CTIA wireless conference and it was probably the worst computing experience I've had in a long time. The rubberized keyboard was virtually stuck to the surface with almost zero tactile feedback and the Operating System of the OLPC spends a painful 2-3 minutes to boot. Even launching a new application seems to take an eternity.
The user interface of the OLPC doesn't even feel worth of a cheap fisher price toy. If I were to rank it, it would be somewhere above DOS and far below Apple's Lisa (predecessor to the Mac Operating System). I can't wait to test drive the Eee PC.