I could easily spend hours just browsing in here and the staff are friendly enough that they'd let you. Also, unlike many comic book shops, there's actually room for you to do just that. They really have the best selection, too. They carry all of the more well-known works but they also have indie and local books and proudly display artwork for sale around their walls and staircases. They've even got zines and small-run editions. The second floor is where you'll find the superhero and manga books.
They also support the community by sponsoring exhibitions, selling tickets for them, and doing signings and launches.
Much as I love this place, I have to be really careful about how often I'm there, otherwise I run the risk of spending too much dough!