Started reading Harry Potter and the Methods of Rationality again. I had a copy a while ago but it seems to have vanished. For those not in the know, the book is written by Eliezer Yudkowsky and the LessWrong folk.
I'm not normally a fanfiction kind of person, most of the stuff I have heard of tends to be...strange. Slash and suchlike. However, this is actually quite good.