Global Popularity of Programming Languages
lethain.com
lethain.com
As far as I can tell, the way it is being normalized is relatively popularity for the search term within search terms in that category. I.E. that 'Python' was the most popular (relative to other programming search terms) in Cuba. This means that it is, in a way, trying to normalize over programming population (if we accept the somewhat plausible premise that only programmers are searching for programming topics), but the results still aren't great.
It would be nice if Google made some raw data available, but I'm not holding my breath. :/
Russians speaks the Russian language most of the time. It easily explains the search density results for Russia and Belarus.
Also, from the comments:
By his method, Forth is most popular in the US, then Canada, then the UK, then it flattens out.
Brainfuck is most popular in Germany and the US. :)