I think that what we know about the rate of genetic adaptations in other animals probably doesn't apply to humans. Genetic drift in small, isolated populations probably plays no role, since small, isolated populations of humans are very uncommon. Natural selection plays little role in humans (except in our responses to new viruses, etc.) because "natural" selection occurs when some trait conveys a reproductive advantage. Modern human societies exhibit an almost inverse relationship between the best genes (for coping with modern life) and the number of offspring one produces (see: The Limits of Cultural Adaptation, below). Thus, neither mechanism seems to apply to modern humanity - we have structured our societies so that evolutionary forces are by and large excluded.
As if that weren't bad enough, even under powerful selection pressure, evolutionary change is very, very slow. Even if we were somehow evolving towards a better adapted human (better adapted to modern life), how many adaptions might have occured in the last two decades? For comparison, how many new versions of Microsoft operating systems have we had to deal with in that same time?
The point is that what I call Lifestyle change occurs far faster than evolutionary change. No natural evolutionary changes could possibly keep up with the rapid changes in the way we live - changes that our technologically-driven society continues to impose on us.