The four types of gamer

[HoloDust]

Nice article.

Here are some classifications that you might find interesting:

http://www.gamasutra.com/view/feature/6474/personality_and_play_styles_a_.php?print=1
http://kotaku.com/5938464/theyve-narrowed-gamers-down-to-eight-fundamental-types-which-are-you