Bloggers, by country

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"It should not be much of a surprise that the most bloggers (29.2%) are located in the U.S. In fact, there are more than four times as many bloggers in the U.S. as there are in the second most populated country within the blogosphere - the U.K., which is home to 6.75% of bloggers.
Japan accounts for the third-most bloggers (4.9%), followed by Brazil (4.2%), Canada (3.9%), Germany (3.3%), Italy (3.2%), Spain (3.1%), France (2.9%) and Russia (2.3%)."
Source:  Inside Blog Demographics, Sysomos, June 2010