Get a configurable screensaver that will pull an URL, or at least open a specified text file. For Winblows I personally enjoy ActiveScreen . It uses a highly adaptable ASCII config file (described here) for refresh rate, location, etc. Now you can point it at your personally written CGI script and make nearly anything into your screensaver. So for instance let's say you're running framechat like a good Monk. In theory you could point the screensaver at your framchat script and you now have a PerlMonks Chat Screensaver! You are limitted only by what you can do with a CGI script.

Caveats: the program has a free trial period, but at $25.00US it's worth it. I am at work so I have not tried framechat on it. Let me know if it works. You can set the screensaver to run executables so I wouldn't recommend this for a sensitive environment.