The campus that never sleeps. That's a tag line that Apple uses for iTunes U a free service that gives higher education institutions a way to offer audio and video content (presentations, performances, lectures, demonstrations, debates, tours, archival footage) and it's all free.
There are plenty of open courseware offerings and though it is designed for colleges, much of the content would be appropriate for professional development and selective use with students.
I'm at NJIT and we are one of the schools using iTunes U. You can get more info on using the service at our site http://itunes.njit.edu/
or Apple's site http://www.apple.com/education/itunesu/
We have 2 good series on world literature in our site and a new series called "The End of the Essay" that is 2.0 juicy in that we are hoping to have educators not only listen to the podcasts, but interact with us on our wiki
and a related blog
and push us in new directions with the topic and podcasts - perhaps even add user podcast content. We'd love to have you join in.