"Actual evidence from Razib would, of course, have dominated other considerations."
To make the evidence compact I'd have to produce some charts showing that when a new large effect QTL is published there's often a media blitz (perhaps via # of articles published as a function of time), but that as time passes the finding is not validated by subsequent researchers using a wider set of populations. As it is, what I have is personal experience of being excited about a new QTL repeatedly, and then being disappointed. And lots of personal communication as to the reality of what Carl Shulman is talking about re: publication bias and fiddling around with experiments until the p-value comes out correct from my friends working in genomics, psychology and the interstices.
If I were naked to the field, I would go to google scholar and poke around for the citation history of loci implicated in cognitive performance variation.
Oh, and for the record, I think IQ variance is a moderately-to-highly heritable trait. I'm arguing about genetic architecture here, not whether variance is due to genes or not (I think a large proportion is).
Link.
"Razib Khan has an academic background in the biological sciences, and has worked for many years in software. He is an Unz Foundation Junior Fellow. He lives in the western United States."
Razib's writings can be found on his blog, Gene Expression.