What is it?
If you are both a Go player and a computer user, you may be playing on-line on Dragon Go Server (DGS). If you are a little bit compulsive, you may end up checking the Web site every 17 seconds to check if it's your move yet. If you're also a Linux user, you should really be using Gkrellm because it's so cool. The natural answer is then to add a Gkrellm monitor that checks whether it's your turn yet or not.
dgsmon is a command-line utility written in Perl. As such, it will work on mostly any Unix system, and should work on Windows provided you have ActiveState Perl installed (I haven't tried it — let me know if you have any success or failure stories).
Basically, you'll need to set up your username and password in a file, install Gkrellm's plugin Fmonitor, and call dgsmon from a crontab. You'll get all the info on how to use it with a simple:
dgsmon -?(Obviously you'll have to put that in your path somewhere).