This Planet Money podcast, called The Giant Pool Of Money is fascinating. One of the more interesting thoughts it triggered is that the global store of capital (the Giant Pool of Money) was bigger before the collapse than after, and that recent government expenditures haven't really grown it much beyond what it was at the peak of the housing boom.
I know a lot of people are worried about inflation, and one of the biggest arguments they make in support of that idea is that governments are going to have to print more money in order to support their stimulus packages. But a tremendous amount of money simply vanished in the collapse, and some portion of the "new" money is simply replacing it. At least, that's my intuition. I may be completely misreading the data.