Isn't this just cool?
Take a look at this post from Genetic Future. It concerns the genetic population structure of Europe, and it seems that the genotypes can be used to pretty accurately predict the geography. Of course I expected a lot of population structure when considering all of Europe, but I am a bit surprised that there is this much structure between, e.g., Swedes and Danes.
I haven't read the paper refered to yet -- I will print it when I get to the office tomorrow -- but this is pretty cool.
What does this mean for association mapping, by the way. Is the HapMap CEU sample based tagSNPs equally good for all Europeans, or what?