I’ve just stumbled upon SpaceRip which truly is a fantastic youtube channel. Lots of very high quality educational movies there, with great CGI and excellent narration.
For instance this one on the basic evolution and future of the Universe is inspiring while accessible to a general audience I think (as usual, one can remove the subtitles with the rightmost button of the player, and view in HD and full screen):
Actual scientific references are mentionned on wikipedia.
Another favorite of mine is the past and future of the continents based on Ron Blakey’s simulations: