Spent a week in Philly at a conference...I went to school in Philadelphia from 1997-2001, so I was nostalgic, but I know the food scene has changed a lot since I've been there last, so I looked up recs from this wonderful website....reporting back....
I'm from Los Angeles, by the way, I think that's important to note one's taste and background...
--Here's a google map of a list of restaurants from this Board, though I was not able to make it myself to many of them...
-Branzino: Italian, $$$...their specialty is the Branzino fish, a tender, whitefish that is delicious but their accompanying sauce was strange, even for a foody like me!! As Chef Ramsey would say, way overcomplicated and just weird. Our favorite was the rabbit ragu which came with delicious al dente homemade pasta. My husband enjoyed their lamb shank.
--Bonte Cafe: a new experience...the best waffle I've ever had! sugary, cinammony...the waffle version of a cinnamon bun, best with their delicious coffee! good cheap breakfast.
--Penang: an old favorite of mine...large portions! and good fresh food.
--DeNic's in Reading Terminal Market: I ordered the Pulled Pork sandwich with Provolone and Broccoli Rabe as recommended..be forewarned that this is a strong taste which my husband didn't like at all, but it was definitely interesting. My husband ordered the beef brisket which personally with regard to meat I preferred.
--of course had to show my husband what a real cheesesteak is like, so I brought him to Jim's Steaks. Delicious and so incredibly fresh!
--Marrakesh: exotic moroccan atmosphere unforgettable from when I lived in Philly back then...the food is okay. I think the ground chicken was vegetarian. Much better that that Moroccan place near Rodeo Dr. on Wilshire in Los Angeles.
--Monk's Cafe: per Citysearch one of the best hamburgers. comparable to a gourmet hamburger in Los Angeles. great bar to hang out in.
--Buddakan: atmosphere nice and fancy, but food okay. larger portions that I remember getting when it first opened year ago. Quite Americanized "fusion" Asian food. I prefer real Asian food.
--Marathon Grill: A great last-minute find. The bread on my sandwich was good but difficult to bite a piece out of. compared to other restaurants, great deals to be had here.
--Naked Chocolate Cafe: only if you love chocolate, as my husband was not a big fan. Serves European style very thick hot chocolate. Yum.
--Sinju Sushi: more expensive than I expected. BYOB. They have a long list of their special sushi rolls of which we picked randomly, and they turned out really good.