Or.....and you won't have to pay shipping for this method...join a Freecycle group, offer your computer, and somebody who needs one will respond to your offer and come pick it up.
http://www.freecycle.org
Thanks for the info and laughs!
Freecycle is one way to go. Another site that's really good is www.abcfree.com. You don't get bogged down with hundreds of emails with ABC Free because they have more targeted alerts. Also, local schools get first shot at whatever you offer, so a local kid might end up using your computer.