I have been playing SmartGo a bit… well I only played a couple games, but I have been playing with some of the other features and I have to say that if you have any interest in playing Go at all, you really should get this program. Speaking of playing games against it, here is my second attempt at a 13×13 board with it. I took a 5 stone handicap since I am still a high kyu player… probably lower then I think, but it has been a while since I played anyhow, so until I get used to thinking that way again I’ll stick to saying I am a high kyu player. I added comments to that game… To use that file you’ll need SmartGo or another good SGF reader, of which there are lots out there.
For those looking for a nice screensaver, there is SunXi’s Go Screensaver. This reads SGF files and displays them on your screen with a very nice 3D effect. Beautiful to watch.