I tackled the financial crisis in my latest HNOKC.com column, here.  An excerpt:

The other way that we can live counter-culturally and according to the scriptural story is by spending our money differently than society tempts us to. Scripture invites believers to share a portion of their property and income for two reasons. The first is that it helps individuals set priorities and make the choice to at least commit part of themselves to opting out of the economic system, because no matter how good, every economic system exploits and oppresses. We cannot completely escape the economic system, but we can commit a percentage of our income to witness against it.