When I lived (briefly) in New York, I did a mini self-guided cupcake tour of Manhattan. Cupcakes abound in that crazy place, and I was extremely excited to start a similar endeavor upon moving to Philadelphia. However, I haven't had much luck so far.
Brown Betty Dessert Boutique in Northern Liberties had a fairly yummy specimen, but I went to their shop near closing time and their bake case was nearly empty (even though it was 15 min til closing, the door was locked and I had to knock insistently until the lady on the phone finally let me in!), and I actually didn't even get to try the flavor I wanted because they had run out, which put a bit of a damper on the experience...
Naked Chocolate's cupcake was okay. A bit dry (both icing and cake) and pretty reminiscent of the cupcakes at NYC's Magnolia and Buttercup Bake Shops...good, but not WOW.
Have you found any great cupcakes in Philly?