Thanks heaps for plug!

I couldn't follow his discussion of "evolutionary drift" vs. "evolutionary draft." Could you take a shot at explaining it some time?

Bookmarked.

I didn't fully understand it either, but I think the basic idea is that a gene which is itself neutral can act as if it's under selection if it's pretty close on a chromasome to a gene that is under selection.

It seems to me that this would only work when a beneficial mutation show up; the alleles of nearby genes get an undeserved frequency boost, and competing alleles might disappear entirely. But a harmful mutation should never become common in the first place.