I've got a couple of P-Pros gathering dust.
I've got an Athlon-600 in my basement that used to be a file server.
Was too noisy, turned it off a year ago.
I've just setup a P-II as a squid proxy for R&D at home.
I've got 3 P-IIIs that I just got from work - they were destined for the trash.
The entry level desktop at work is a P-4.

And Trenton State Computer Fair is next weekend - it calls me to gather more trash.