Please read the notes on that page (also included below).
These videos are QuickTime movies and use the new H.264 encoding.
This provides great compression while maintaining good quality. To
view these videos you will need QuickTime 7 or later. These movies
are 480x320 (15fps), which is enough to read the slides and screens
in most presentations. The video stream runs at ~120kbps and the
audio at ~32kbps.
NOTE: these files are optimized for streaming, but if you plan to
view them over time or multiple times, please save them as a local
file rather than viewing the stream. The hosting for these is
sponsorted by Contegix and Undersun Consulting.