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In Safari you can click play on the video, open the Activity window (Cmd-Alt-A), then snag the URL the actual .flv file is being pulled from.

Could you paste the URL here? I tried finding the .flv file in the activity window, but I couldn't locate it.

Search for "Crockford" on the YUI Theater homepage. The videos are available for download in M4V format, along with zipped PowerPoint slides.