I got this one from the flea market. It came with a P3-600 processor, no memory and no hard drive. I've added some memory and it is now running Damn Small Linux until I can scrounge up a hard disk.

It's nice but the exhaust fan runs a bit loud for my liking. I'm not sure what model this corresponds to since the BIOS setting to disable the full screen HP logo is ignored.

EDIT: The back of the chassis states that it is a NetServer E56 P3-533. once you get past the HP logo it shows the computer as a NetServer E200. Go figure.