Powerboat Review recommends the following
web sites:

Boat Design Net Powerboat Forum: Discuss powerboats, review production, semi-custom, and custom powerboats, and talk about new powerboat designs on the Boat Design Net Powerboat Forum.

PowerboatListings.com: Performance power boats, raceboats, sportboats, center consoles, sportfishers, cruisers, and yachts for sale. Post your boat for sale, or find the powerboat of your dreams.

Boat Design Net: Boat design and boat building projects, plans, concepts, reviews, and resources. Directory of boat and yacht designers and naval architects.