What galls me is that people can get so paranoid about security that they remove the hard drives, when it's easy enough to do a wipe. Couple weeks ago, I bought a 2.1gHz Athlon XP system at a garage sale for 5 bucks... but no HD. It's getting harder to find PATA drives these days, at least the cheap ones.
Couple winters ago, I found a dead P4 at the side of the road... that goof thought that cutting the power leads to the HD was good enough. ;-) Pulled it out & got an 80GB drive with all his data on it. (Which I wiped before reading) Now it's filled with music in my sister's computer.