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drc500free comments on 2011 Less Wrong Census / Survey - Less Wrong
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Here's one that closely imitates Raven's Progressive Matrices and claims to have been calibrated with a sample of 250,000 people: http://www.iqtest.dk/
Here's another one: http://sifter.org/iqtest/ . I can't find any mention of where the questions came from or how it's calibrated, but it's shorter and doesn't require Flash.
Neither one asks for an e-mail address or any identifying information. They might be too easy for some on LW, but harder ones tend to cost money. As Viliam_Bur pointed out, any free online test's validity is questionable, but the first one is basically a direct copy of a "real" test, and neither one has any apparent ulterior motive. Anecdotally, they were both within 10 points of each other and my "real" score.
Some data points: IQ (age 7, 14, 20) = ~145-150 S-B SAT (age 16) - 1590 = ~150 S-B iqtest.dk (age 29) = 133 S-B sifter.org/iqtest (age 29) = 139 S-B (159 euro scale)
I don't use my spacial skills in my daily work they way I used to use them in my daily school work, and both online tests seem to measure only that.
I found the second test much more difficult - there wasn't enough information to derive the exact missing item, so you had to choose things that could be explained with the simplest/least rules. There were some where I disagreed that the correct answer had a simpler rule-set. The problem style is also highly learnable, and I question the diagnostic value of "figuring out" that you're looking at a 3x3 matrix where operations occur as you move around it, but various cells have been obscured to make the problem harder. Not including instructions makes it feel like there's a secret handshake to get in.