Saw Zak Penn's movie The Grand and I loved it. It's a mockumentary in the world of professional poker. Woody Harrelson plays a guy who has to win a major winner-take-all tournament in order to save his grandfather's casino. The cast of the improvised film includes actors and comedians (some of whom are well known for playing poker in real life), some popular professional poker players, and some acting turns by directors. Werner Herzog is brilliant as "The German."
I'm not sure if this movie will be entertaining to people who don't already enjoy watching professional poker on TV. But if you do, you will probably LOVE it. I would buy this movie on DVD right now if I could.