I'll leave the debating to other people, but here are some things I found interesting about the article you linked to...
- J. Phillipe Rushton, one of the authors, is currently the head of the Pioneer Fund, which is listed as a hate group and has been critiscised numerous times for pseudoscientific racism and supporting segregation and 'back to Africa' hate speech. It was founded in the late thirties by men with strong ties to the german Nazi movement, especially Henry Laughlin, who 'proposed a research agenda to assist in the enforcement of Southern "race integrity laws" by developing techniques for identifying the "pass-for-white" person who might "successfully hide all of his black blood".' He also spoke many times about how America should have a eugenics system similar to that of the Nazis.
According to Wikipedia (which is hardly flawless, but whatever), 'The 1937 incorporation documents of the Pioneer Fund list two purposes. The first, modeled on the Nazi Lebensborn breeding program,[11] was aimed at encouraging the propagation of those "descended predominantly from white persons who settled in the original thirteen states prior to the adoption of the Constitution of the United States and/or from related stocks, or to classes of children, the majority of whom are deemed to be so descended". Its second purpose was to support academic research and the "dissemination of information, into the 'problem of heredity and eugenics'" and "the problems of race betterment".'
The Pioneer Fund's current approach is probably best seen in the form of one Richard Lynn. To quote the Southern Poverty Law center:
"Blacks are not only less intelligent than other races, Lynn asserted, but also "more psychopathic." Putting a new twist on the "science" that once supported slavery, Lynn concluded that because of their "psychopathic personalities," blacks are more aggressive than other races, less able to form long-term relationships, and more sexually promiscuous, reckless and prone to lying.
But Lynn's pal at Pioneer has identified at least one countervailing factor. "Blacks have a genetic edge," Rushton said, "when it comes to sports." "
- Rushton has also contributed many articles to the magazine American Renaissance, which has been linked many times to white supremicism. Among many other things, they believe "interracial and inter-cultural marriage is racial suicide and an unequal yoking, and that such unions go against the very community which marriage is designed to establish".
The editor of American Renaissance is one Jared Taylor, who "has often expressed great personal distaste over the presence of non-whites in Europe and America". In a speech delivered on 28 May 2005, to a British far right group, Taylor made clear his feelings on the offspring of interracial marriages when he said "I want my grandchildren to look like my grandparents. I don't want them to look like Anwar Sadat or Fu Manchu or Whoopi Goldberg."
- Rushton's scientific technique has been blasted on many occasions. One complaint is that he approaches data with preset conclusions in mind, and 'shows' that his ideas are right by asking other people to prove them wrong. This technique is most often used by fundamentalists and anti-evolutionists, among others of that ilk. He's been repeatedly accused by people like renowned geneticist Stephen Jay Gould of allowing personal bias to colour his data.
- Rushton's data itself has been called into question due to his habit of 'aggregation', or giving all data equal weight regardless of their quality or whether they exhibit a strong bias. He's claimed to use over '100 years of research', despite the fact that intelligence tests as far as the late fifties have been repeatedly shown to be extremely biased and inaccurate. This tendancy of assuming that all research is equally valid and correct is at best naive and at worst deliberately misleading.
- Did I mention that Rushton's book, as well as one by his partner Arthur R. Jensen, are both available for free on a pro-eugenics website?
http://neoeugenics.home.comcast.net/~neoeugenics/ - The American Psychological Association has officially disowned the genetic-intelligence hypothesis, stating "There is not much direct evidence on this point, but what little there is fails to support the genetic hypothesis".
- Speaking of Arthur Jensen, he's also recieved more than one million dollars in funding from the Pioneer Fund. While apparantly not as neck-deep in deranged bullshit as his pal Rushton, he's still pro-eugenics and his research has also been heavily featured in, you guessed it, American Renaissance magazine.
So, yeah. I know that being funded by white-supremicist, neo-nazi eugenicists doesn't necessarily mean that your research on how black people are inferior to whites is tainted (well, it probably does, but whatever). Just something to think about, anyway!

EDIT: Hahahahaha, just reread that article and they're seriously trying to verify CHARLES SPEARMAN. I mean, come on. Spearman was a eugenics-advocating elitist fuck who
deliberately altered all the results he got by classifying anything remotely contradictory as 'faulty', in such a shitty and obious way that he was the laughing stock of the scientific world for decades. And these guys are actually taking his "research" seriously? Check out this article for a brief history of Spearman and his influence on these guys:
http://www.hirhome.com/rr/rrchap7.htmRushton and Jensen are hacks, from a long line of hacks, and that paper has as much scientific value as an episode of Superfriends. Steel, I'm sorry for getting in the way of the debate, but I didn't think this stuff would come up otherwise and I wanted people to know that this guy's views are as scientifically worthless as they are morally indefensible.