The documentary "Slacker Uprising" follows Moore’s 62-city tour of the swing states during the 2004 Presidential election as he rallies young voters to show up at the polls.

The 97-minute film will be available in high-resolution, free download in North America. Those who are interested in watching the film can visit the Web site SlackerUprising.com to sign up for the download in advance of its September 23 online release.

Moore said he is doing the online giveaway for personal reasons. "I realized that in a few months it will be the 20th anniversary of my first film, ‘Roger & Me’," he said.

"I’ve been very blessed and fortunate to have so many people come to my movies over these two decades, I decided the way to say thanks was to make one that the fans can have for free, as a show of my profound appreciation of their support."

The download is being distributed by Robert Greenwald’s Brave New Films and it is being offered by BlipTV.

Moore says none of the parties involved will make any money from the film, which had a budget of just over $2 million. "This is being done entirely as a gift to my fans," said Moore. "The only return any of us are hoping for is the largest turnout of young voters ever at the polls in November."

The download will be available for three weeks and will be released on DVD on October 7.

The film features appearances or performances by Eddie Vedder, Roseanne Barr, Joan Baez, Tom Morello (of Rage Against the Machine), REM, Steve Earle, and Viggo Mortensen.

"In the interest of fair warning, people who are not fans of mine will not like this movie," Moore states cautiously.

"This movie has way too much of me in it, and way too many tens of thousands of people liking what I’m saying. If you’re a McCain fan, this film should probably be rated X."