Here's a cool calculator I found today. The Thrid Way, a moderate think tank, has a calculator that will calculate where your federal income tax money goes. Just type in the total amount you paid in taxes and it gives you an itemized list of which programs get your money and how much they receive. It also calculates how much each taxpayer is on the hook for the national debt.
Not only does it calculate your share, you can sort alphabetically or by percentage share. If you hit the Expand All link it breaks down the expenditures even more, i.e. from Defense, to all its components.