The recumbent-riding, touring cyclists who write BicycleTouringOnCarFreePaths have added the carriage roads of Acadia National Park to the non-commercial website -- information on the paths, why you'd want to ride them, and how to plan for the trip.
http://bicycletouringoncarfreepaths.org/
The Great Allegheny Trail, C&O Canal, Pine Creek Trail, Greenbrier River Trail, P'tit Train du Nord, and Mickelson Trail are also covered in detail on the website.
If you ridden any of the paths, and want to tell other touring cyclists about the best beer and ice cream, campsites, and lodging possibilities, hope you'll add your recommendations -- or disrecommendations, as the case may be -- to the Riders Suggestion pages for all of the trips.
It's getting to be touring season, right?
Jeff