My main rig circa 2005:
Specs:
P4 1.7GHz Willamette at 2.1GHz
A bunch of SDRAM
ASUS P4B (Intel 845 chipset)
Radeon 9600 256MB (passive card, modded with fan and cardboard shroud made from a granola bar box - I still have the card, and it works!)
Soundblaster Live! 5.1
120GB Maxtor HD
Some optical drives
Some crappy PSU
Also, here's a picture I found of one of my old folding machines. I believe this was a Pentium 3, 667MHz or thereabouts:
