When movies start to matter beyond entertainment value, box office receipts and popcorn sales, is that a sign that the end of the world is nigh? We've been writing a lot lately about Michael Moore and the impact of his latest film, SICKO, Leonardo DiCaprio, who's been relentlessly promoting his environmental film, The 11th Hour. Last year, Al Gore generated a big splash (and cries of "Gore in 2008!") with his end-of-the-world-as-we-know-it slide show turned Oscar-winning film, An Inconvenient Truth, which I first wrote about at Sundance in 2006, when Gore shocked me by showing up for the Q&A with a passion I'd never seen in the man before. Amy Berg's wrenching Deliver Us from Evil, which played last year at Toronto, brought the issue of the alleged cover-up of decades of sexual abuse committed by priest Oliver O'Grady by the Catholic Church to the forefront. Suddenly, it seems, documentary filmmaking isn't just about informing -- it's about affecting real social change.