Toshiba Satellite Pro 430CDT, Pentium 120MHz. 48 megs of memory, 10gig hd.
Running Debian sarge with kernel 2.4.19 with pre-empt patch.
The router machine, connected to 2mbit cable modem, Planet SW-800 switch and Mustek 600VA plus UPS.
This box acts as a debug terminal (serial) and NAT/firewall box. It also runs irc bouncer and some irc clients.
It also filter my email for spam (spamassassin), runs proxy to remove those annoying adverts/popups (privoxy), and acts as a nameserver proxy so I don't need to set up my LAN /etc/hosts on each machine.
Typically I use it remotely from Pegasos via AmTelnet, but occasionally I also use Xami for X access (for websites not working on amiga browsers, for example).