World Stats Counter

This website provides running tallies on several world-wide statistics:

http://www.worldometers.info/

Data on Population, Energy, Economics, and Health are all constantly “updating”, brought you you by the Real Time Statistics Project.

In addition to the obvious questions one could ask, like “At what point will the world’s population grow to over 10 billion?” or “When will the earth run out of oil?”, there are interesting meta-questions like “Where do these models come from?” and “What assumptions are being made to calculate the amount of money spent on weight-loss programs?”.

Another nice resource to play around with!