There are a lot of great GoogleMapMashups out there. Here’s one that I’ve been missing all this time: Jacktracker
Okay, maybe I haven’t been “missing” it, since I’ve become rather disinterested in 24 since season 2, but if you have a friend coming to town that’s rabid about the show, it might be kinda fun to tour all the locations. There are lots of other sites like this, check out the CNET article. It wouldn’t work for all shows, like something limited in locations like House or Deadwood but it’d be cool if someone went back and did some old shows like Rockford Files or X-Files (with real locations used and of course the locations they were supposed to represent). Or maybe someone could do a celestial version for Battlestar Galactica.