I came across a very interesting graphical representation of distribution of Internet users across  major countries for the year 2008, including the type of traffic and how the Internet has grown over the years:  

Here are a few interesting facts:
In terms of sheer number of Users, the top 5 countries are:
1 China
2 USA
3 Japan
4 Brazil
5 India

-210 billion emails were sent daily in 2008, 78% of which were spam!
-In 2008, e-commerce spending was $6.8 trillion! 
-Streaming media acounted for 8% of total internet traffic!
-74% of the population of Japan uses the Internet as compared to 4% of India!

Check out the graphical representation at http://img132.imageshack.us/img132/2988/27062201.jpg