I have used craigslist extensively the past few years and HAVE NOT FAILED to sell anything I have attempted to sell. Some things took a little longer, cause once the local market reads the same ad for weeks at a time, they tend to skip over it.
There's usually someone out there looking for what you have to sell. It's free, but you have to be careful.
I never post my phone number any more. I did once and ended up getting auto-spammed by some chick asking if I would like to be able to accept credit cards. Ya, I just have to give them my bank account number and personal log on. They can make it happen. F*** you.
No more phone numbers. I screen all possible buyers with email. I set up a demo/look see and we meet and make the deal. I offered an air conditioner for sale and gaged the selling price by how many email responses I got. I asked $175 for it, got only a few emails. No one really serious. Just a couple inquiries. I dropped it by $25 and got about 50 responses. Quickly sold it.
Great site.