I've had my boat hauled here: http://www.brby.com/

These guys are well recommended by Morgan's Cloud: http://billingsmarine.com/

My dad has used this place in the past: http://www.robinhoodmarinecenter.com/

And of course there's always: http://www.hinckleyyachtservices.com/home.html or http://www.morrisyachts.com/Service/

And there are a ton more. A good directory can be found here: http://www.maineharbors.com/