At last, I found Linux a use for my home.
In a post about firewalls, I read Telexen's smoothwall recommendation. While it couldn't be used at the place I was posting the thread for, I built a machine at home that is now a dedicated Linux router/firewall.
Built with old stuff, P120, 48 MB RAM, 1.2 GB HD.
Doing its job quite nicely with much less hardware than ICS on Win2k, and probably more secure.