Once I have managed to survive a comic buying spree (whee!), and depending on the time of day, i will go to one of three places and drink/eat while pouring over comics, or sketch while flipping through comics:
*Neighborhood Restaurant... oh the breakfasty brunchy goodness.
*Block 11... definitely for the fine coffee/ tea palette, this is a great place to sit and enjoy while examining anything in wonderful detail... i especially like the superhero feel of sitting in the back in the bank vault, or hanging by the fireplace.
Here's a few links to Union SQ. websites, and a few more general/other Somerville ones:
Flickr Groups:
http://flickr.com/groups/unionsquare02143/
http://flickr.com/groups/somervillema/
http://flickr.com/groups/somervilleartscouncil/
http://flickr.com/groups/davissquare/
http://flickr.com/groups/portersquare/
http://flickr.com/groups/somervillearchitecture/
http://www.somervilleartscouncil.org/
Upcoming (Events website):
http://upcoming.yahoo.com/group/3389/
And of course, The Somerville Public Library, right up the hill:
http://somervillepubliclibrary.org/