If you haven't seen Expelled yet, I highly recommend it. Expelled documents how academia has attempted to shutdown debate over Intelligent Design. It also describes how Intelligent Design proponents are often blacklisted by their peers.
Here is a brief excerpt from the movie. Apparently Richard Dawkins, an outspoken atheist, really doesn't have a problem with Intelligent Design. He allows for the possibility that there could be an intelligent designer in the form of a superior alien race. But he refuses to consider the possibility that the Intelligent Designer could be God.
Incidentally, the notion that our planet could have been "seeded" by an alien race was the premise behind the movie Mission to Mars.