And he lights up the proceedings and raises the temperature.

I want a PC to use as my household server, both internally and externally. I want something that is low-powered, preferably to the point it doesn't need a fan and hence runs silent, to be on 24 hours a day. I'm thinking one of them tiny boxes with a Via chip in it. I figure it'll pay for itself in saved power in a reasonably short time. I'll probably run FreeBSD or OpenBSD on it. Does anyone have experience and/or recommendations?

(I could easily use the G4 for the job, but it does make noise. The current internal household server, my Compaq FreeBSD desktop, is sturdy and stable enough to be a server and remarkably quiet, but just a bit thirsty.)