Hey all,
Friend of mine started a site at sweetopenroads.com, with the goal being creating user-rated cycling maps based on open source data and comments and ratings from riders. I used it to find sweet rides and traffic free routes up in NH around school. The founder is a fellow dartmouth alum and a great guy, and he just opened up beta invites.
Anyway, it's only open to the northeast right now, but it'll soon be expanding to the rest of the country, so send me a PM if you want an invite to get in on the action.