I donate all techie stuff, old furniture and clothes to the local Goodwill or The Salvation Army. You can fill out a slip that itemizes what you are donating. At tax time, you can use the IRS fair market value breakdowns to determine how much to deduct.

I always go at the high end for the techie stuff, even though the stuff is not really the top of the line anymore - I look at it as...the people who are going to get it probably think it's some pretty cool shit, just like I did 3 years ago when I shucked out the dollars for it.