This discussion list has over 250 members and good traffic. It's been operating since 1999, so there are lots of archives.
An excellent source of information from the many Nor'Sea devotees, including a history of the design, membership cruises, an owners' list, and some technical tips and ideas.
One boat's owners present photos of construction and various cruises in their Nor'Sea 27. Useful links page.
A newsletter, active from 1996 - 2002, for Nor'Sea 27 owners. Advice, photos albums, gear tips, cruise accounts, position reports, the usual stuff. Diffuse but worth browsing if you are interested in the boat or the cruising/liveaboard life.
Builder of the Nor'Sea 27 and Nor'Sea 37 traditional full-keeled yachts designed by Lyle Hess.