The creators of the Weekender. There are links on the Stevenson Projects pages to other boat builder organizations and BBS that I don't participate in, so can't personally recommend.
Membership is free and automatic.
Genesis and Steel Away, two Weekenders being built by Bruce Jones and Mike Donlin, are profiled here. John's Weekender Page John Abbett is a woodworker building a Weekender in a one car garage. He has some great tips for those building in confined spaces. A great site that will make you laugh. Excellent construction pics.