It is indeed quite surprising that there wasn't systematic posting on this, given the amount of interest in prisoner's dilemmas and such things. It is maybe because the traditional game theory is bound to traditional causal decision theory which is not much popular here, but nevertheless I would be interested to learn more about it.
I found these Yale lectures on Game Theory to be a wonderful introduction to the topic. I think they cover all the basic points and lay a very good foundation. Perhaps we can find good resources like this and vote on them, taking the best and adding them along-side the Sequences.
Are there any areas of study that you feel are underrepresented here, and would be interesting and useful to lesswrongers?
I feel some topics are getting old (Omega, drama about moderation policy, a newcomer telling us our lack of admiration for his ideas is proof of groupthink, Friendly AI, Cryonics, Epistemic vs. Instrumental Rationality, lamenting how we're a bunch of self-centered nerds, etc. ...), and with a bit of luck, we might have some lurkers that are knowledgeable about interesting areas, and didn't think they could contribute.
Please stick to one topic per comment, so that highly-upvoted topics stand out more clearly.