for selling,
http://www.afternic.com can be really good, there are buyers there that will pay more than it is worth in pleanty of instances.
lots of people look at it too so if you want to sell it for a decent price and not hold out for way more than it's worth you shouldn't have a big problem selling it on afternic.
or just link to auctions and spam away message boards, might not get as much money though but could still sell some crappy ones to suckers.