I put together an introductory screencast for MochiKit this week,
presented via the interactive interpreter example:
http://mochikit.com/screencasts/MochiKit_Intro-1
This screencast was recorded with Snapz Pro X 2 and was encoded with
QuickTime using the H.264 video and AAC audio codecs. I've confirmed
that it's playable with QuickTime 7 and VLC 0.8.2, but may very well
be playable elsewhere. It weighs in at 22M for 13:24 at 640x480.. so
you can probably stream it with any sort of broadband connection. If
it becomes slow for whatever reason, there's a mirror at archive.org:
http://www.archive.org/details/MochiKit_Intro-1
A script for the screencast is available here (though there are some
minor differences, it's close enough):
http://mochikit.com/screencasts/MochiKit_Intro-1.txt
The screencast is in the public domain, and I have a lossless version
(PNG video encoding, raw audio) available upon request (647M).
Snapz Pro X: http://www.ambrosiasw.com/utilities/snapzprox/
QuickTime: http://www.apple.com/quicktime
VLC: http://www.videolan.org/
-bob