for those who speak german, the multimedia server of the university of Tübingen:
http://timms.uni-tuebingen.de/
medical stuff:
http://videocast.nih.gov/default.asp
I start to love those guys, heard they also were involved in leading scientists pleading for openly accessable scientific literature
special events at princeton:
http://www.princeton.edu/WebMedia/special/
lectures at princeton:
http://www.princeton.edu/WebMedia/lectures/
ethics:
http://ethics.acusd.edu/video/