Well, I'm not being dismissive at all...but the Ancient Astronaught theory has always bothered me just a bit--or at least some iterations of it. Some iterations of this notion seem to discredit our own ability to self direct our own evolution--an ability shared by all things. Animism is just a preference of mine, all things are conscious and have a part in there own development.
Then there's the fact that we are not at very much different from the rest of the animal kingdom, tool building, opposable thumbs, language, social structures, even seemingly human problems such as bullying and rape exist in other animals. How are we so different again? (rehtorical question! But answer if you must...)
Now the star seed thing does still resonate, we sense that it somehow feels right, but we're not certain why.
Look at the "stars are spitting out organic matter" thread in the science forum.
Also, please reemember McKennas dealio about mushroom spores having possible ET origin, and of course the part that he posits the mushroom may have played in shaping our evolution, and why we're far advanced from them.