I just learned of this statistical website from Buslib-l. It claims to pull together statistics from a variety of sources including UN, WHO, World Bank, etc. generates charts, and has global coverage and looks pretty impressive!
It is at http://www.nationmaster.com/
Since I hadn't known of it, I looked at the reviews it hosted and found a Nielsen/netRatings 10.13.05 report on educational reference web sites (Wikipedia, etc.) which
reported that "educational reference Web sites attracted nearly 46.4 million Web users to reach 31 percent of the active Internet universe in September 2005." It's an interesting read!