Saw the Dead 30 plus time have a few hundred concerts, always a joy to hear. a couple of others:
Mike Bloomfield & Al Kooper:
http://www.youtube.com/watch?v=YSqlUYkx8d0
Alvin Lee just passed away a couple of weeks ago after a surgical procedure:
http://www.youtube.com/watch?v=UNHqUhGEFZM
Stevie Winwood & Clapton 2007 (wonderful) rendition of Blind Faith song from 69:
http://www.youtube.com/watch?v=VT-SFgkVlno
And Bo Diddly as done by Quicksilver Messenger Service:
http://www.youtube.com/watch?v=xgKIifVi8eg