Please report any dead or new links immediately.

American Boat Listing - Powerboat and Sailboat database search engine.
Boat Trader Online - Large listings. - Slow even at 56K. More than 4,000 power and sailboat listings.
Boats Online - FL - Worldwide marine advertiser.
Don Robertson's Marine Marketplace - Sailboats, Gas Powered, Diesel Powered, Commercial, Houseboats, Antiques. - Sloooooow, not sure about listings. - FL
SuperBrokers - We are a network of boat brokerages located throughout the Great Lakes. We are pre-owned boat specialists carrying a large lising of yachts, sailboats, powerboats, and freshwater boats.
Usenet -
Water Ski Boat Exchange - Specialized ski boats listing.