I am also very interested in the greater Boston area. I live in Billerica, bordering on Carlisle.
Carlisle is a black hole of cell coverage, and even though my official sprint coverage map says that I have great coverage I had to get an Airrave since I was on and off roaming at home. (Positive note: my 3g speeds on the airrave are excellent, with my Comcast backhaul )
I was really hoping for a new tower nearby, but it's not a big deal since I get decent coverage by the time I get to the end of my street. At home I just got the airrave so I could get calls consistently...not so worried about data there with wifi.
What worries me is that all the surrounding cell sites seem to have NV complete status, but 3g speeds are still abysmal (driving around; not on airrave) I don't care for blazing fast speed. I just want to be able to stream my music again on my drive to work. Or load a web page in under say, 30 seconds.