There is a site called cycling torrents,
http://cyclingtorrents.nl/index.php, that has a lot. I'm new to the world of torrents though, and have had some difficulty with them. The downloads can take ten hours and then the playback can start-stop-stutter. I've got broadband. It's a bit frustrating because there seems to be a lot of stuff out there but if the docu is going to shudder every 20 seconds it's just not worth it. You guys have better luck with them?