Don't forget the classified section of 48North...
I have been successful in selling two boats on Craigslist. One hint I have for you is to create a website for your boat.. Patterned after what Yachtworld does. Lots of pictures and detailed information. Make it easy for people to find out about your boat. The 4 or so pictures and limited formatting options on Craigslist isn't good enough.
Example: Catalina 30 For Sale
Good luck on your sale.. I'd like to take a moment to brag that my father circumnavigated on a Downeast38 in the 1980s and 1990s