For the first time, the Internet had over one billion users who were 15 or older in December 2008.
Here's an excert from the press release:
The Asia-Pacific region accounted for the highest share of global Internet users at 41 percent, followed by Europe (28 percent share), North America (18 percent share), Latin-America (7 percent share), and the Middle East & Africa (5 percent share). . . .
China represented the largest online audience in the world in December 2008 with 180 million Internet users, representing nearly 18 percent of the total worldwide Internet audience, followed by the U.S. (16.2 percent share), Japan (6.0 percent share), Germany (3.7 percent share) and the U.K. (3.6 percent share).