Free online classifieds are by far the best way to sell your unwanted goodies. Yes, Craigslist is the main attraction these days, but there are a few choices other than the big C that can produce decent results.
The one I use the most is freeclassifieds.com. Free to sign up and place ads with an easy posting process. All fifty states are covered, and you can search the entire country very easily, unlike Craigslist. The best feature in my opinion is the ability to see how many people have read your ad. I love that because you can see if writing efforts have worked. Also, the internal messaging feature is great – your responses are categorized by the ads you have listed. The posted messages are sent to you via email as well.
Although you most likely don’t get the traffic of Craigslist, I have found that my results have been very good, with several reads and inquiries for most of the ads I have placed. It is definitely my #2 site to place free ads. I’m always looking around for good free selling spots, so if you know of anything worth checking out please let me know about it.