Gets me thinking a little more about dirt. The movie is also available to watch online at - http://documentaryheaven.com/dirt-the-movie/. Note that near the bottom of their web page, this site states -
"Please Excuse The Ads Which Pop Up On First Click. These Have Nothing To Do With Us. They Are Built Into MegaVideos Player & We Do Not Support Popup Ads of Any Kind!"
I was able to watch the entire movie online WITHOUT downloading that software.