I put together a new firewall and a new file server. The firewall is an ALIX 2d3 -- a tiny, low-power x86 SBC with onboard 3xLAN. The whole thing runs on 7-20V. Also, there's no heat sink ahe disk is compact flash, which means no moving parts!
The other machine is a new file server. It's replacing three older machines and a half-dozen Vservers. The hardware isn't as exotic as the ALIX, but I do have some pictures: