I love the PDQ Bach piece for "Horn and Hardart".
My family used to drive to Howard Johnson's to enjoy the fried clams and ice cream (pre-Baskin Robbins). Also have memories of going to the local Dairy Queen on hot summer nights (for Mr. Mistys and Peanut Buster Parfaits). There was also a competing "generic" place called "Dairy Creme" a few blocks away. Not as good, but much cheaper.
Also, I remember a place at the local college's student union my friends and I used to stop at after school for corn dogs.
Now that I'm thinking about it, there was also a "Corner Sundry" in my hometown where you could get various things like sodas and malts (it was also my main source for comic books!). I remember getting a "Green River" soda which was like a major sugar fix. Also, the local cafe where you could get old-fashioned malts, burgers and fries.
Man, once I start looking through the memories there's a ton of stuff to remember!