Index of the City sets by category I'm running trough bricklink, peeron and brickowl, but I can't find a "good" (I mean 'fitting my idea') index to browse across city sets.

Is there a kind of list like 


vehicle

cars
trucks
planes

buildings

houses

7641

police station
...



does anyone of you have knows a such index ?

note: my english is not fluent, so, here are some precisions:
I'm looking for "houses" sets on ebay to complete my son's town streets.
He has a lot of vehicles, but a few buildings
No, but Brickset now provides the facility to enable one to be made. See http://brickset.com/article/12960/tags-a-new-way-to-search-the-database