I've "stickied" this thread as I think it will be a good resource, and for what it's worth, I've been using Color Services in Needham, MA to process and make contact sheets for color film. Haven't as yet, had them print (or scan) anything, but I've been happy with their work. http://www.colorservicesllc.com/

Also, I've had Palm Press in Concord, MA make large gelatin silver exhibition prints. I can't really print bigger than 16x20 in my darkroom, and they have made some beautiful 20x24's for me. http://palmpress.com/

Lastly, there is Panopticon Imaging which I have never used, but have, nonetheless heard good things, and seen some gorgeous prints. http://www.panopticonimaging.com/