This looks interesting – so here is a post from comScore Networks. It announced the launch of "comScore World Metrix, the first true estimate of global online audience size and behavior based on activity from the world’s largest online behavioral research panel. The comScore World Metrix panel has active representation from countries that comprise 99 percent of the global Internet population. In launching comScore World Metrix, the company announced that 694 million people, age 15+, used the Internet worldwide from all locations in March 2006, representing 14 percent of the world’s total population within this age group. This number marks the first worldwide universe estimate based on a consistent methodology across all countries.