Terry Pratchett, Making Money (2007). 2007, you'll notice. Not 2009. Pratchett has really done his research, and in the course of a bristling, highly readable comic fantasy, he does a pretty good job of lampooning the commodity theory of money, especially in its more goldbuggish incarnations.
In part, Making Money is inspired by the founding of the Bank of England (though the differences are instructive). It's a bit unfortunate that Pratchett so cozily aligns the interests of state and the commoners against the interests of the parasitic aristos. That means that his rival understanding of what money is -- not a commodity, but a network of credit, backed by state power -- isn't really tested as thoroughly as it should be. But the bulk of the novel is amusing and educational, and by the end, things get more weird in a magical kind of way, until finally there's a really interesting thought experiment about value as it relates to banks, money, automation, "intrinsically" precious materials and (especially) labour. I've written a fair bit about this book, which will see light of day eventually.