A colleague just sent an email about Fora.tv to our graduate student listserv. It's a repository for speeches, discussions, and debates that seems like it would be extremely useful to teachers in English and Rhetoric classes. A description from the site:

FORA delivers discourse, discussions and debates on the world's most interesting political, social and cultural issues, and enables viewers to join the conversation. It provides deep, unfiltered content, tools for self-expression and a place for the interactive community to gather online.

The interactivity seems to come in the form of posting comments, tagging videos, or even posting your own video content. Essentially it's YouTube with less Numa Numa kid and more Noam Chomsky.