Check Out The Ultimate Tax Analyzer at MyGovCost.org
Here's a very sharp and interesting tool that analyzes what your lifetime taxes go to pay, how much you've got left to kick, and how much that money would have made you if it had been invested in a portfolio earning about 6 percent a year.
Click on the screen cap above to go to mygovcost.org and monkey around with the calculator, which breaks things down via categories ranging from Medicare to military operations. The example above uses a 40 year old making $60,000 a year.
Here's a vid with more info: