Some of you have likely seen this already, but for those of you who haven't, Eliezer recently finished a series of Tumblr posts on writing intelligent characters in fiction. It can be found at http://yudkowsky.tumblr.com/writing and is IMO worth a read.

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[-]Shmi150

Apparently Wildbow, upon being shown this, replied "I dunno, I just do what feels natural." For the rest of us, there is this Eliezer's writing guide.