Scott,
I got a lot of traffic on my listing when I sold my last boat over at http://www.glangler.com/boatsforsale.html.
It's $70 to list it, but it gets lots of traffic. You can try some of the other sites like Spoonpullers, Great Lakes Fisherman, Educated Angler, and Sanders Fishing Guides for free listings.
You should DEFINITELY add as many pictures as you can to all of your listings. That'll help you sell the boat a LOT faster.