If you're a Belgian beer fan, and there are plenty in Philly, you have to get to Fork and Barrel in East Falls. In the former location of the Pour House. It's said that Philly has more Belgian beers on tap than Belguim.
My two favorite Beer bars are TJ Everyday's in Paoli and Teresa's Next Door in Wayne. Teresa's still has the upper hand on TJ's though and the staff is mad knowledgable too. Great place, great beer and great food too.
dont remember what beers they have on that only bin there twice (both Wild nights) but i Like COPLEY'S they make a mean kamikaze (Vodka,trip sec, and lime juice for color)
I was just up in Philly last week and visited the South Philly Tap Room and Pub on Passyunk East. Both places were excellent but the atmosphere at the POPE was a little more to my liking. Good selection of microbrews at each.
the South Philly Tap Room is great. Great food and an awesome beer selection. I also love Monk's.