My brother sent me a link to WashingtonWatch, a blog/wiki that attempts to calculate the net present value of various legislation pending in Congress. Some legislation saves taxpayers money, but most of it costs us. As the methodology page indicates, this isn't the last work on the financial aspects of legislation, but it's a place to start.
Porkbusters is another good site that focuses on pork-barrel spending by our Congressmen. The quote by Trent Lott at the top of their page is priceless.