I had a great thrill this weekend when, as I was driving up Broadway on my way to Yankee Stadium, I passed the diner where the Seinfeld gang hangs out. (The address must be in the FAQ, which I don't have handy; I think it's between 100th and 115th somewhere). I'm sure New York resident fans are used to this kind of thing, but I thought it was pretty cool as I am a Bostonian who was just in NYC for the weekend and just came upon the site by chance.
What other Seinfeld sites really exist?