I noticed septembereleventh.org has an audio MP3 of David Ray Griffin's UW-Madison talk. I'm still listening, but it's really outstanding so far. 1 hour 22 mins, 33 MBs:
here's a page with .WMV video of Griffin's excellent speech in Madison. I downloaded the 25 MB version and it looks fine. I gather it may not be the actual CSPAN-2 feed, since it is free of CSPAN logos etc.
Spread the word! C-Span has decided to air David Ray Griffin's Madison, Wisconsin lecture again, this Saturday, May 7th, at 2:30PM EST (11:30AM West Coast). Here is the announcement directly from C-span's website.