This is rather vague actually. Postmodernism lumps together hundreds of ideas and concepts. These ideas vary greatly in their usefulness and their bullshit content. Any statement broad enough to cover all of postmodernism is trivial and unhelpful- I'm not sure there is a "Postmodernism for rationalists" waiting to be written. For a general overview the wikipedia article is really, really good.
Also, attention RationalWiki writers: Derrida was not the founder of postmodernism.
I'm not sure there is a "Postmodernism for rationalists" waiting to be written.
But maybe there are some specific topics or methods or approaches that would fall under "postmodernism" or "critical theory" or "deconstruction", and that could be interesting or useful to rationalists.
Or something like "this is how postmodernists would approach such-and-such a subject, and their analysis has some value in this case".
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.