Yep it would be interesting to see also international data (someone also posted a question about European data in the blog comments).

There are interesting stats on Alexa regarding SO (don't know however how reliable they are): http://www.alexa.com/siteinfo/stackoverflow.com Click "Traffic stats", then "Stackoverflow.com’s Regional Traffic Ranks".

Interesting to see SO being 22nd most popular site in India while ranking 166th in the US, and only 363rd in China.