I have two PCs...
Main PC - for games, OpenOffice, CD burning, Amiga.org ;-), etc
Athlon 1800+ on some unknown Tiny PC m/board
512MB DDR RAM, nVidia GeForce FX5600/256MB, running Windows 2000 Professional
Generally pretty stable, but slow because of the HDD and the amount of crap I have running :-)
Webserver
Compaq PIII-600
128MB SDRAM
Also running Windows 2000 Professional, nice and responsive since I'm only running Apache on there most of the time.
My main PC also has a 10GB partition set aside for Linux but sadly GRUB and LILO always fail on my machine for some obscure reason :-(