Anyone who hasn't seen the recent documentary
I.O.U.S.A. really owes it to themselves to track down a copy, and check it out -- it's the American financial situation's equivalent of An Inconvenient Truth. For any of us in our twenties and thirties, this tells without a doubt what the future of the US will look like at the end of our lifetimes fifty years from now, barring massive action.
(They have a half-hour preview on their website, but the full movie is worth it!)