Shawshank Redemption - everytime it's on tv
Star Wars duh
Indiana Jones - Raiders of the lost arc, and last Crusade the most.
Lord of the rings - FOTR. TTT doesnt have as good replay value, although it was better the first few times I watched it
Tremors - seen it WAY to many times... and the sequels...
Cant think of anything else that comes close to these. I know i've seen each over 100 times. I've had them in my dvd/vcr on loop play for weeks at a time so every time I sit down It's on...