Nearly all the available statistics about how many blogs and bloggers there are estimated to be relate to the US. We have Technorati's estimate of about 10.3 million blogs. PubSub has a similar number.
During Les Blogs in Paris last month, one of the presentations I saw (can't recall which one) talked about there being over 30 million blogs not in the English language out there in Asia.
The number of people operating blogs on the Internet totaled 3.35 million in Japan at the end of March and is seen more than doubling in the next two years, while blog-based markets are expected to expand by about 40 times in value by the end of March 2007, the government said Tuesday [17 May].
About 16.51 million people visit blogs at least once a month, according to a survey by the Ministry of Internal Affairs and Communications. The influence of "blogs will certainly grow in Japan, just like in the United States and other countries," a ministry official said. (Kyodo News)
Hard to find any meaningful numbers at all for Europe. Does anyone have any?