I play with the CBVA in Boston, and it's a pretty good group of guys. They're playing in the outdoor season now, which is casual and pick-up style play.
Starting in September they will be starting indoor play in Cambridge. Indoor play is divided in to 3 sessions. Advanced, Intermediate, and Recreational.
Indoor play is on Sundays at the following times for the different divisions:
Anyone can play in the Recreational sessions, but you need to have your skill rated in order to play Intermediate and Advanced as they're more competitive in nature.
Check out http://www.gayvolleyball.net/
for more information