What's the story regarding Graham Hancock?

So…most of us probably know about Graham Hancock’s books and theories.
Can any-one tell me if there are internet resources where these theories are discussed scientifically?
Your opinion also welcomed!

Essentially, he’s a journalist lacking in critical thinking skills. Seems to believe in every Psuedo- Archaeological theory on Earth.
http://www.csicop.org/si/show/tracing_graham_hancockrsquos_shifting_cataclysm/
http://www.badarchaeology.com/?page_id=547

Thanks for the great reply and links!