The U.S. government has aggregated channels and videos from across departments and agencies onto one site, YouTube - The U.S. Government Channel. Channels and playlists are organized by topics such as White House, NASA, etc. (channels) or "Defense and International" or "Money and Taxes" (playlists).
Ernster, the Virtual Library Cat
Above the Law - A Legal Tabloid - News, Gossip, and Colorful Commentary on Law Firms and the Legal Profession