How Can I Donate Old Hardware to Developers?

olddoc asks: "I have a computer I'd like to get rid of. It is still pretty useful for a developer, being a fairly powerful dual Athlon MP box, but there is no Microsoft OS on it so most charities in the area don't want it. I live in Eastern Pennsylvania, USA and I'm sure there are dozens of people who are developing GPL or BSD licensed software, who would be happy to get their hands on it. If my old computer is used to help develop free software, I'll get all warm and fuzzy inside. If I get a tax deduction for it so much the better. Does anyone know how to give a worthy project a hardware gift?"