meh...Lucas based it all on Joseph Campbell's "Hero's Journey" which is itself a study of ancient mythology and how stories are retold throughout generations. Just read Campbell's books.
I enjoy storytelling, writing and mythology, so I found them interesting. Campbell was much too spiritual a man for me, however, and he lost me sometimes with his mystical way of thinking.
I like the History Channel and they make some quality documentaries, just not sure this will shed any new light on the subject for me personally.
Just did a Google search. Here's an interesting site relating to this: