Anil Kandangath created a site called Where did my tax dollars go? It allows users to enter income and filing status, and produces a nifty interactive pie chart showing what Federal programs they paid for. (Spending data via Louis Garcia and Andrew Johnson's What We Pay For.) Here's the (non-interactive) output for a married/filing jointly family earning the median (2009) income of $49,777 (see page 40):
The results are similar to my figures, albeit entitlements are a bit lower in their chart--I'm not sure why. Surf over to Where did my tax dollars go? and try yourself.