Kerrylula,
There are already several posts on the forum regarding trips to Maine :
Maine Fall Road Trip (29-09-2005)
Maine (13-09-2005)
Boston/New England (17-08-2005)
Maine Road Trip in March (29-03-2005)
New Orleans to Maine (12-06-2005)
Many touristy places (motels, museums, restaurant, etc.) might be closed during the cold season but you'll manage to find everything you need I'm sure. I don't particularly enjoy crowded places so if you're like me you're going to love the coast during the winter (or should I say spring?)! It is so quiet and peaceful.
Happy planning!
Gen