I did a presentation on this when I was in college (breaking our energy consumption down into visuals that people could relate to). Link to the treehugger article:
http://www.treehugger.com/files/2010...cond-video.php
We use (globally) about 40,000 gallons per second which is, coincidentally, about the average flow of Jog Falls in India (video below)
40,000/42=953 barrels per second
953x60=57,180 barrels per minute
57,180x60=3,430,800 barrels per hour
3,430,800x24=82,339,200 barrels per day
I should note that the video is taken during the rainy season during which the flow is above average so it's a little misleading.
I recall doing a calculation that showed that the City of Chicago Proper used about 2.5 Soldier Fields a day of coal (actual coal consumption, I adjusted for the regional generation mix of coal, nuclear, and natural gas).
Interesting stuff. Really puts things in perspective.