I recently found and have been watching some panel videos on this YouTube channel. Pretty good coverage with some that I would have liked to attend but couldn’t! And many of the more popular panels that had overnight lines…like the Firefly 10th anniversary panel, the Joss Whedon panel or the Doctor Who panel and many more…
http://www.youtube.com/playlist?list=PLB21A6076BE1E72AC&feature=plcp