I was just coming over here to post about this one. I find the whole movie implementation really impressive.
Not sure that Google has yet figured out how to let the public know about its many features, though, including this one. Somewhere, I remember I could search airport codes and do calculations and check FedEx shipments, but after a while it all blurs.
Anyway, if you enter...
...in the search box, you'll be prompted for your location if Google doesn't have it. At that point, you get the cleanest local movie search I've seen anywhere... beats the Sunday pink section all to hell... with a star rating system, links to reviews, maps, and an option to sort by theatres.
They scope out my metro area extremely well, though an option to widen or narrow it geographically would be very useful, albeit probably resource intensive.
I also tried some cast, credit, and story searches of old movies, and the results were surprisingly good... and in fact could be bypassing IMDb, though I see they do have an IMDb link.
I would think a next step for Google would be a local TV schedule. I don't watch TV much, and often don't have a schedule handy. Current online schedules, like local newspapers and TV Guide, are unbelievably slow. If Google can return TV scheds with anything like the speed of the movie schedules, it's going to have another local winner.
What's not clear is whether people looking for schedule info are in a mode to search for anything else... movie or TV reviews maybe, but I'm not sure about popcorn ads or whatever.