http://www.google.com/movies

Try it.

Example: My city, my favorite multiplex :)
http://www.google.com/movies?near=Pune&tid=af252477bd0bf4e

This has been available on Google.com in the US for almost 3 years. I guess its slowly getting added to some of the other localized versions of Google.

Australia just got this feature in Feb. 2008: http://google-au.blogspot.com/2008/02/make-tonight-movie-night.html

Colin is right, it seems to work only for the US, Australia and India.

It works in Canada. Though it asks for a U.S. zip code or city, I was able to enter my Canadian postal code and get results. And I have been able to so for a while.

It works for UK cities too. Or at least it does for Sheffield, UK:

http://www.google.com/movies?near=Sheffield%2C+UK

It seems to use the same backend for all countries. Although if you visit the localized domains, you get different labels for the text box:

US: US city or zip
http://www.google.com/movies

Canada: City or postal code
http://www.google.ca/movies

Australia: Postcode or suburb
http://www.google.com.au/movies

India: City
http://www.google.in/movies

UK: Town or post code
http://www.google.co.uk/movies

Thank you Bill and Tony, I wasn't aware for these 2 countries.
BTW: this [movies] operator has been completely translated in French since years, but still not available in France ;) [but for French Canadian it might be useful]

[Moved from "Google.cn's movie search" – Tony]

http://www.google.cn/movies
http://www.google.cn/movies?near=%E5%8C%97%E4%BA%AC&sort=1

I always use this before going to the theaters.