The New York Times has an interactive tool on their website where you get to fix the budget. You are given a set of options for either saving money or increasing revenue. You choose the options you like, and the tool shows you how it will affect the budget both now and in the future.
This site should be required viewing for Republicans who want to cut taxes and for Democrats just want to keep spending. You really get a sense of exactly the amount of sacrifice we will all have to make if we want to balance the budget.