Based off the very rough comparison of my SAT score with my GRE score, my IQ rose around 10 points in the interim (a gap of about 10 years), and I did begin reading LW during that period. However, my own impression is that most of the increase (if it even exists) came before I started reading LessWrong, and the increase instead came from economics blogs and literature recommendations which I mainly got from economics blogs. One of those early blogs was OvercomingBias, so I suppose that could be seen as a win for LessWrong. Previously, most of my reading had consisted of either school work or fiction, typically Sci-Fi or Fantasy.
I feel I've learned a lot about problem solving from less wrong (and HPMOR in particular). be concrete, hold off on proposing solutions, et cetera. The effect*, unfortunately, doesn't seem to be as much as I had hoped.
Small increases in intelligence are extremely general and even recursive, so it feels worth the effort. But, I found alternatives much more effective (though still modest) then studying/discussing/applying the sequences. like meditation or smart drugs.
I'm interested in other lesswrongers experiences in cognitive enhancement.
* by "smarter" I mean "better at problem solving", where examples of "problems" are writing a program, finding the right thing to say to resolve interpersonal conflict, memorizing some random fact quickly and then recalling it quickly/vividly. let me know if you want further clarification.