See the excellent Georgia Department of Consumer Affairs Guide (pdf format) listed below. In addition, here are some other helpful suggestions from Emory computer professionals on campus:
Some would like a cash donation with the non-cash item if it is not in perfect working order. Examples:
Website: groups.yahoo.com/group/Freecycle-ATL-ITP/
Many PC sales outlets will dispose of old gear for a small fee. Keep in mind that this stuff should not go into the land fill, as it is filled with noxious chemicals. Office Depot and Micro Center have been two that have been used in the past.