I have a Shuttle ST61G4 in the closet at my parents house. Still works, and it's rocking a 3.2GHz Northwood P4 (with HT!). Only qualm I have is that the onboard graphics on it might grow outdated - you know, what if Microsoft makes a new OS, oh, let's call it "Vista", and adds fancy visuals that this card can't handle?
HP 8200 Elite (MX100), Thinkpad t440s (840 evo POS), HP 6530b (M500). Dell U3014, HP 2511x, HP L1740, HP LaserJet 4050, Pioneer SP-BS22-LR with Lepai amp (without SSDs).