A transcript of Moglen's June 2004 Wizards of Os keynote is just now online: http://emoglen.law.columbia.edu/publications/berlin-keynote.html
The audio (which I prefer) has been online for a while: http://www.archive.org/download/3_do_t1_11h_3-Moglen_a/3_do_t1_11h_3-Moglen....
After Stallman, Moglen's the best free software speaker I know. I think it'd be good for the FS movement if he was more widely known.
In the first few minutes of this talk, I think audience members could get the impression that he's unfortunately too academic, but he clears himself of that if you listen past the third-of-the-way point. The questions and answers if excellent too.
More info, audios, transcripts, etc. of Moglen can be found in Wikipedia: http://en.wikipedia.org/wiki/Eben_Moglen