IBM xSeries 342 server, for rack mounting. All three drive bays are populated but both power supplies are fried. I may replace the PSUs some day but then I'd have to wire a 220 twist-lock outlet to plug the stupid thing into.
OQO Model 02 handheld computer. 1.5GHz processor, 1GB RAM, 60 GB HD, 800x480 LCD, 802.11 a/b/g wireless, Bluetooth, full slide-out backlit keyboard, Wacom digitizer screen. Runs Windows XP professional but is capable of running Windows 7 or 8.