Inside the Arena:
If you're a premium ticket holder, you've got a few great options for dining. The totally renovated Banners Harbor View is a fine dining restaurant on Level 6, as is the Insight Club Lounge with a sushi bar and cocktails.
For the regular season ticket holder, you got some good choices too so not to worry. A great meeting spot pre-game is Paulaner Bier Garten is on the train platform in North Station. This full service bar transforms into a Bavarian Beer Garden and when the doors to the Garden open, you'll be right there. Another spot open to all ticket holders is The Hub on Level 4. It's also a full-service bar and with amazing views of Boston.
As for regular concessions, everything is pretty standard fare. There's a Kosher Cafe in the Balcony at Section 304 and Pile High Deli at Sections 16 and 323 is a nice alternative if you're looking for something other than hot dogs and such. For drinks check out On Tap (Loge Level Sections 1 and 12) or Shots Sports Bar (multiple locations - check our map). As for beer selection, you'll find Sam Adam, Stella, and Guinness stands around so your choices are pretty good. Be sure to check our stadium map for exact locations of these and other concessions.
One more thing: on non-game days, try to check out The Sports Museum on Levels 5 and 6. With several exhibits celebrating all Boston sports it's $10 for adults, $5 for kids and seniors, and children under 10 are free. Visit http://www.sportsmuseum.org/ for more info.
Looking for extra ticket? Find them here! Be sure to include game and date on your post.