Steve Badger used to have an excellent one at http://www.playwinningpoker.com but I see he isn't maintaining that one but provides some movie links. http://www.pokertop10.com has a listing but I can't get the site to come up at the moment.

Here's a non-inclusive list I copied down from somewhere of movies that have a poker/gambling/card game theme.

California Split
The Sting
Kaleidoscope
Born Yesterday (1950, hearts, rummy, ?)
Run
The Gambler From Natchez
Bob LaFlambeur (foreign flick, Bob the gambler)
Dark City
Sunset Trail
Loaded Pistols
The Queen of Spades

Like Lock, Stock and Two Smoking Barrels these movies have gambling as a plot device and may not be a "poker movie" like Rounders or Cincinnati Kid was. View at your own risk!