This thread is a bit old, but I just found it. Please bear with me and my late reply.
My opinion is that Mensa should have nothing to do with your CV. The concern about boasting or trying to appear superior is a valid one, so I'd recommend just keeping it quiet when applying for work.
However, there is a lot more to life than your CV. One of the keys to success in life is to learn that the most important asset anyone can have (more important than intelligence, creativity, leadership ability, aptitudes, people skills, or good looks, while some or all of those may very well be important, however less) is their connections to other people. Never burn a bridge behind you without knowing for sure that there's no other option. And if ever a chance to meet and network with a new group of people comes up, jump on it!
That's the true value of Mensa - it's a networking opportunity. If you really are "too intelligent to care about Mensa" then you've missed out on a group of people that might provide you with interesting connections and conversation, mix of ideas, and the opportunity to rub shoulders with people who just may change your life. OR you may just change theirs. It works both ways. Nothing ventured, nothing gained. We're social creatures. Why not make use of that when an opportunity presents?
It's not a typical OB/LW subject, but Robin correctly pointed out that most rationalists are outside OB/LW, and so I'm asking about one of the organizations that might hold many of them.
A couple of weeks ago I took a supervised IQ test by Mensa due to curiosity and for some CV padding (cheap signaling is a perfectly rational thing to do). Now I got a letter back from them that I'm in top whatever %, and they'd like me to join. I wasn't really planning joining Mensa, or anything else, so I'm wondering - does any of fellow rationalists have any experience with them? Is it worth bothering?
As a bonus here's a quick description of their supervised IQ testing process:
They compute percentile based on both tests separately, and higher of two counts as the result. So you can has 0 points on one (if at all possible), and respectively 148 / 132 on the other, and you're in (2 stddev above mean, or top 2%). The tests obviously check knowledge of obscure English words and meanings and ability to deal with pressure in addition to intelligence as such. Well, I guess no test is perfect.
So Mensa - good or bad?