You'd love the 2hr special on History called Ancient Aliens. Dunno if it can be viewed online, but it's worth a purchase if this stuff interests you.
http://www.history.com/shows.do?action=detail&episodeId=416574
BTW, I personally think this theory meshes *perfectly* with the major religions, if taken from the following perspective:
*God/Allah/etc created the universe, life and consciousness (but not just on one planet out of billions)
*Civilizations elsewhere in the universe understand this
*Civilizations elsewhere also understand that intelligent life will eventually destroy itself (contrary to God's intention)
*When new unadvanced life is "found" (say, around the Nile 5000 years ago), these Ancient Aliens provide knowledge of math, astronomy, written language AND a warning of how people should live. Be moral, value life, etc. (the Ten Commandments).
*These moral teachings are *so* important that they are recorded, with the help of the Ancient Aliens, into the books that form our religions. Without knowledge of space and high technology, early man couldn't possibly describe Ancient Aliens as people from outer space. So, they're messengers from God with indescribable power.
*Ancient Aliens know that, to keep man from eventually destroying itself, they must also send a message that can withstand time (better than books to be interpreted by future man). They design and help build the Egyptian and Mayan pyramids. What message do those timeless, indestructible structures send? That there are greater powers than man himself. That we don't/can't know everything based purely on our knowledge, scientific reason, etc. Finally, beware of man's own abilities, as they can result in its own destruction.