Just to be clear, I am pefectly well aware that "racial" groups have far more overlap in genetic diversity than they have differences. You can compare individuals in intelligence. You can compare population averages, although the averages aren't all that different. But even if the averages were much different, you couldn't project population averages to individuals, because the population variances are huge.
If Neanderthals were still around (more than some genetic remnants), it would be cool to analyze the differences. I suspect that they wouldn't be generally less intelligent than homo sapiens, but that they'd have slightly different strengths and weaknesses. I could see that being really useful for team building with complementary skill sets. As it is, with all of our "racial diversity" humans are a monoculture compared to what it would be like if we had more high intelligence species.
Anyhow, "Are whites more prone to discriminate against other groups?" isn't necessarily a dumb question. None of those questions is stupid from the point of view of detached scientific inquiry. The answers are all going to be mostly or completely "No," but science is often about asking stupid questions, even if the effect is to provide quantifiable evidence for something we intuitively knew. Also, that the answers are "no" is not intuitive to everyone. Moreover, slashdot has linked to plenty of cases where scientists tested something "obvious" and the results came out different from what we expected.
There IS some basis to say that some populations (on average) are smarter than others, when it comes to variation in specific strengths and weaknesses. Racial groups have been apart long enough that we've all adapted a little bit to slightly different environments. We're all more or less well-adapted to those environments, and since those environments have some differences, we're going to have some differences. An example is skin color. It's likely that humans living in Africa 1/2 million years ago had a medium brown complexion, owing to the higher density of trees, greater moisture, and other factors making sunlight exposure less than it is now. As the environment in Africa became more arid and sunnier, humans there adapted to develop darker skin, while those who migrated to the far north developed lighter skin so as better absorb the more limited UV radiation and generate enough Vitamin D. (Incidentally, Inuits are too dark to generate enough Vitamin D where they live, so traditionally, they would get it from blubber. Now that they have adopted more western diets, they're getting sick due to insufficient calciferols.) Another difference often pointed out (but hot much if it's genetic I'm not sure) is how Africans tend to have superior social ability. Although this doesn't necessarily imply anything about other components of intelligence, it may represent a tradeoff, where different human groups all have about the same average intelligence, and as a result, greater social intelligence will trade off against other kinds of intelligence. One example I recall reading about many years ago pertained to children with cognitive impairment. A white child with an 80 IQ will be generally retarded, while a black child with an 80 IQ will be socially normal.
BTW, I've always argued that social intelligence is a major blind spot for IQ testing. That doesn't mean that IQ is useless. It just means that sometimes, IQ will underestimate someone's over-all intelligence if they are smarter in an area that IQ doesn't test for. There are other kinds of intelligence left out of IQ, such as bodily–kinesthetic.
And one last thing. In 100 years, hopefully this line of inquiry regarding racial intelligence will be as boring as questions about gender intelligence. Also, hopefully gay marriage will be boring too. We'll have some knowledge about these things, but we won't prejudge people on those basis. We won't assume the neighborbood is going to hell if a minority family moves in, and we won't disown our children if they turn out gay. But at this time, there are many people who would love to pervert science to tell a story that gives them permission to be assholes to other people, which forces us to carefully analyze those questions. (But of course, when science goes counter to their preconceived notions, they'll reject it.)