The torrents contain the videos plus the presentation's slides in PDF format. Most videos are about 50 minutes long.
If you don't have a torrent client, I recommend uTorrent v1.8.5.
You can also rip the YouTube videos yourself with the FireFox add-on Video DownloadHelper.
[360 FLV] | Low quality, Mono | Roughly 150MB | Ripped from YouTube. (How to play FLV files.) |
[OGV] | Low quality, Stereo | Roughly 230MB | Ogg Video format. |
[720 MP4] | Medium quality, Stereo | Roughly 500MB | Ripped from YouTube. (Highest quality available from YouTube.) |
[Orig MP4] | Highest quality, Stereo | Roughly 630MB | The original non-transcoded file. |