Account, with before-and-after photos, of the restoration of a 1973 27-foot Catalina. Site includes interesting accounts of various trailer-sailing adventures.
Unmoderated forum on amateur boatbuilding. A good place to get advice and resources, but you need to dig for the good stuff.
Small-boat cruiser and his wife (he has twice circumnavigated) specialize in partial or complete refits of sailboats and act as consultants for sailboat owners preparing for extended offshore cruising.
Boats damaged by storm or accident are often in remarkably good shape except for one or two significant repairs. If you are up to fixing a boat or having it fixed, this company usually has dozens of sailboats listed, some with an asking price, others for bid.
For wooden boats, here's a widely-supported set of forums on building/repair, designs/plans, people and places, and other topics. There is a lot of advice here, and the chance to ask your own questions. You can also search the back issues index by keyword, then order the issue or find it in your library.