In terms of links to other windsurf board building sites and information, look no further than Anthony’s Board Building Links site (http://www.viser.net/~anthwind/). Anthony put this site online in 1998 and has since had 240,000 hits, which beats my miserly 300 hits to date! His site includes links to site that show how to build a non-composite board, which may be useful especially to the first time board builder. All the sites that I use are referenced from Anthony’s site, so I will not repeat them here.
If you are considering a composite board, I strongly recommend an investment in Tom Sullivan’s video of the board building process (see Anthony’s links site for distributors). Tom does an excellent job of explaining the process. I lent my copy to a guy in Cornwall two years ago and haven’t seen it since (you bugger Nigel!).