Pilot Go is a version of Go you can play on your Palm Pilot. You used to be able to download it here: http://www.geocities.com/CapeCanaveral/Lab/9634/pilot.html (could not connect)
Now, if you were to put your Palm Pilot on the other side of a goban and tell it to play its hardest, how well do you think it would do? Yes, Pilot Go is a very stupid program. It concentrates entirely on filling it its own territory; if you don't mind that, you can just grab the majority of the territory at the beginning of the game and fill it in until the computer gives up and passes.
For good fun, complete a game, have it fill in the empty spaces, and then select "Hint" from the menu.
Even worse than GO81 Gerhard