The Backyard Boatbuilding 2 Mailing List (Discussion about George Buehler's boats and those of other designers that also advocate simple boats that are "Hell for Stout")
DIY Wood Boat (Tips, techniques, and notes on wooden boat building, restoration and maintenance.)
The Duck Boats Mailing List (Building and sailing the 8' Puddle Duck Racer, a rectangular, restricted development sailboat class, and all its variants and offspring, and Ducklike boats of all sizes)
The Minimalist Boater (Insights, philosophy, musings and mostly good vibes about getting the most enjoyment for the least money while just generally messing about in and with boats)
The Mouseboats Mailing List (Discussion about building and using the Mouse and Flying Mouse family of small craft originally designed by Gavin Atkin)
One Ocean Kayaks (How-to tips, articles about sandwich core principles, epoxy, abrasion fabrics, material resources for builders and hundreds of pictures of kayaks under construction)
The Openboat Project (An open source project to develop a basic self-build, low-cost boat that can be used for rowing, canoeing or sailing)
The Wooden Boat Association (Australian organization comprised of groups from throughout the country, open to all owners, builders, restorers and lovers of boats made of wood)
The World of Ferroboats.com ("Devoted to the promotion of Ferroboats as well as a base for all matters Ferro in the boating world," at Hartley & Brookes)
Yostwerks (Tom Yost's aluminum frame folding and wood frame skiined kayak, and inflatable kayak manuals, with free plans)