Canadian Movie Theater Cyberatlas
This Google Maps mashup displays all Canadian movie theaters and drive-ins. The database was compiled by the developers from different sources including the Canada Film Year Book and Cinemaclock.com. There is also the facility for users to add new cinemas to the map.
I particularly like the way the map developers have used different sized map markers to represent different sized cinemas. The bigger the marker the more screens in the cinema. The developers, by the way, are Daniel Naud, Sébastien Caquard and Victor Périchon, who created the map whilst studying at the Université de Montréal and Carleton University.