I think details from the New Scientist article mentioned by Tusko earlier in this thread would inform the discussion a great deal:
Viewing the entire article requires a subscription, so here's a copy for you cheapskates:
There seems to be some difference of opinion among evolutionary scientists about whether we're still evolving significantly. Interestingly, if the scientists who think we're evolving rapidly are correct then that contradicts an oft-stated position of evolutionists here at EvC Forum, that it is small populations that evolve quickly.
--Percy