http://www.gamasutra.com/view/feature/6474/personality_and_play_styles_a_.php?print=1

Interesting paper on Bartles gaming personalities, contrasted with Keirsey’s observation of Myers Briggs archetypes.

Yet additional evidence of Ancient Aliens? Probably just ancient geeks playing Papers and Paychecks. (Thanks to Brandon for the find!)
http://www.cnet.com/news/ancient-d20-die-emerges-from-the-ashes-of-time/