I'm running OpenGoo in house. ... no pun. .. its.. in my house.
OpenGoo is running in a Virtual Machine with a Linux OS. The metal is a 3ghz P4 on a 533mhz bus, 2gig of PC3200 on an 80gig 7200rpm HDD. Currently, only 256meg of memory is assigned to the OS running OpenGoo. This particular metal is also hosting 2 other OS's, and soon to be a third.
Speed wise, I sometimes wonder if running OpenGoo on metal would be better than in the VM arena, but, for all intents and purposes, instead of having 3 machines running all day, much nicer to have one machine running, hosting 3 operating systems. 1/3 of the electricity bill.