Just gotta watch out for the tattle-tales over there. They like to report posts that violate the TOS there. Selling domains is apparently against the TOS.
I just took a quick look through their TOS and didn't see any indication that domains are not allowed.
Visit the CL forums and search for "domain". You'll find all kinds of discussions about this issue.
I'm not sure that the TOS specifically mentions domains (I actually doubt it) but I believe there is language in there that refers to offering products or services that are not available in a specific geographical location, or something like that.
I know eBay is used quite often to sell and buy domains, but I never hear much about Craigslist. It is a viable venue to find endusers? Has anybody here had any reasonable sales through there?