Professional archaeologist Keith Fitzpatrick-Matthews, the force behind the Bad Archaeology blog, recently posted a series of articles detailing the (poor) research techniques and (flawed) argumentation of Graham Hancock. Here are the links to the series:
Hancock’s Fingerprints of the Gods, Part I: misunderstanding early modern cartography
Hancock’s Fingerprints of the Gods, Part II: Foam of the Sea: Peru and Bolivia
Graham Hancock and the ‘Lost Civilisation’
Some of the posts are lengthy — Hancock’s archaeology is, well, bad.