IMDB (International Movie Data Base)

http://www.imdb.com/

I've spent countless hours here, there is everything you need to know about nearly every movie or show. Great site you can learn a lot.

_________________
"There dosen't look like there's much shelter over in those mountains, but that's the only choice I got right now, this is gonna be a long week" - Les Stroud Arctic

I've been to that site a few times. It's excellent for getting info about movies.
If you just want to know about the cars that were in a movie, try this site:
http://www.javelinamx.com/CarStars/index.htm
It's not comprehensive (I've emailed them about "Two Lane Blacktop" and it's still not included.), but it is great browsing for car & movie fans.