I found Carl Sagan's series "The cosmos" so moving I thought I would post/re-post all the links for every episode here for all to enjoy.  Someone put the full versions with updates on youtube 1 hour per episode so you don't have to navigate throught dozens of videos like part 4 of 5, or 9 of 11 or something.  A must watch for everyone.

Carl Sagan's "COSMOS"

Episode 1:  "The Shores of the Cosmic Ocean"

http://www.youtube.com/watch?v=ClPShKs9Kr0

Episode 2:   "One Voice in the Cosmic Fugue"

http://www.youtube.com/watch?v=XJMh_QoKTEE

Episode 3: "The Harmony of the Worlds"

http://www.youtube.com/watch?v=Ql9nEAPMqBs

Episode 4: "Heaven and Hell"

http://www.youtube.com/watch?v=bYgYe3PGSOM

Episode 5: "Blues for a Red Planet"

http://www.youtube.com/watch?v=EptcfnrwM1g&feature=fvwrel

Episode 6: "Traveler's Tales"

http://www.youtube.com/watch?v=eQLEeNoZ5No&feature=fvwrel

Episode 7: "The Backbone of Night"

http://www.youtube.com/watch?v=dU8Jis7WXDw&feature=fvwrel

Episode 8: "Travels in Space and Time"

http://www.youtube.com/watch?v=FZj2yDzXqpA&feature=fvwrel

Episode 9:  "The Lives of the Stars"

http://www.youtube.com/watch?v=3S6L7AjJijU&feature=fvwrel

Episode 10:  "The Edge of Forever"

http://www.youtube.com/watch?v=NFYKe2Tk4vA&feature=fvwrel

Episode 11: "The Persistence of Memory"

http://www.youtube.com/watch?v=XX2BjwOlaNs&feature=fvwrel

Episode 12: "Encyclopaedia Galactica"

http://www.youtube.com/watch?v=lVZhnofdeAA


Episode 13: "Who Speaks For Earth"

http://www.youtube.com/watch?v=1zuD-JbAXYI&feature=related

ENJOY!