The head writer and star of Mystery Science Theater (which barely lives on at MST3k.com), Mike Nelson, has started a new website called RiffTrax. In the same concept of MST3k, but without all the copyright worries, Mike makes fun of a movie, and you can download his Riff Track of the mockery which you then play at the same time as the DVD of the movie, which you supply yourself.
The idea has serious merrit. The only movie available now is Roadhouse, but more are promised and the site even hints at others joining the cast if the site takes off. It's already been Slashdotted and Dugg, so here's hoping! MST3k fans unite! :-)