IQ is well correlated with job performance, so if you think the potential employer cares mainly about future performance (and knows what he or she is doing) include your IQ and that it qualifies you for Mensa. However, I suppose that most people who review applications would see a reference to IQ/Mensa membership as a downside. Mensans manage to be seen as both elitist and low status at the same time. They are usually smart people (mostly smart men actually) who have lower status jobs, so I doubt they would be very useful professional connections.
As to whether joining Mensa might have intrinsic value to you, I don't know. I think they mainly trade puzzles with each other.
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?