Philly cheese steak

In Pennsylvania to visit my brother, so we went to get cheese steak today at Tony Luke's. Here's a pretty accurate recipe for authentic Philly cheese steak, courtesy of Pat's King of Steaks. People have almost religious arguments here regarding which is better, Pat's or Tony Luke's.

http://www.patskingofsteaks.com/recipe.htm

Here's more information:
http://philadelphia.about.com/library/howto/htmakeacheesesteak.htm

So what else is Philly known for culinarily? Apparently soft pretzels and Italian sandwiches (hoagies). See: http://www.bg-map.com/foods.html