Sorry to break the topic subject, but I just watched the movie 21 last night. It's not a poker movie, but it is a gambling movie, and I entoyed the film. It had some holes in the plot, but not so much that I couldn't suspend my belief in reality for a couple hours .
For science/data nerds there is a research documentary "Poker Brain: Inside the Minds of the World's Best Liars" that is interesting. Don't get any popcorn though - those that watch for entertainment will likely be bored.
I watched a movie called "Molly's Game" the other day which is apparently based on a true story. Pretty good flick. Going to read the book when I get the chance.
EDIT: Beaten about Molly's Game. It's a good one, indeed.