There is a cool bar in Philly called "Strange Love" (yep, named after the song) that had Pliny on tap during the national homebrew convention. The owner is an avid beer guy, as are the bar staff. The place is within walking distance of the indoor market/bazaar (name escapes me, but it is adjacent to the Marriott).
I had Nefarious at Monk's Cafe...worth a visit, especially if you like Belgian style beers.
I did the tourist thing and had a few beers at the City Tavern, where they serve 'traditional beers from the time of the revolution' and actors looking like founding fathers will come to your table and not break character (they speak in first person, even if you ask, "how many women did Benjamin screw in his life?"). (Our table had Benjamin Franklin.)