Got this Pentium 4 machine for a pretty low price:

Specs are:
Pentium 4@3GHz
Gigabyte GA-8IDX motherboard
Gigabyte GV-GF3000D (GeForce 3)
SoundBlaster Live 5.1 with a LiveDrive front panel
DVD-RW
512 MB RAM & 40GB HDD
Sooo, not great, not terrible, right? Actually, the coolest thing about this machine is the case. Meet the 1999 Palo Alto ATCX, aka the convertible case. Just take out the drive cage:

And you can turn this case into a desktop:

Even the little badge holder can be rotated (although right now the front panel of this case is a bit yellowed, so I didn't move the badge).
Palo Alto was a company that made cases for all the big OEMs including Dell, Gateway, Sun and others and was widely celebrated for their quality. The case probably doesn't look too interesting, but it has a lot of features (like screw less design for motherboard mounts) and it is certainly one of the most unique ATX cases I have. I remember reading about Palo Alto cases in 2002, but I've never seen one for sale — they were never big on the retail market and were soon sold to Flextronics.
This build also inspired me to try some WinXP gaming. Guess I'll upgrade it from GF3 to FX5900XT I have in my drawer.