Check out "One Third of the Holocaust" on the "Full Length Documentaries" page. It's an easy watch and the guy has a great sense of humor. He doesn't come off as preachy but rather walks you through what he found during his own research. That's the most accessible video I know of that doesn't end up jerking off Hitler at the end. A close second would be the journalist interview with Ernst Zundel. It's basically him dunking on an Israeli journalist that wanted to know why he was a revisionist.