[GSlob]

A good and learned non-PC summary could be found in Rushton, J. P., & Jensen, A. R. (2005). Thirty years of research on race differences in cognitive ability. Psychology, Public Policy, and Law, 11, 235-294.
(the article is available in pdf from http://www.ssc.uwo.ca/psychology/faculty/rushton_pubs.htm)

[Ninian Dryhope]

Nice. Thanks for the pointer.