Last week's This American Life episode was another show about the current financial crisis. Once again, it was the best explanation I've heard about how it all began, and whether the bailout is necessary. I highly recommend giving it a listen.
You can get the podcast free from itunes, or you can download the episode for free here:
If you haven't already heard it, I also highly recommend the previous show about the origins of the housing crisis (it's worth every penny of the $.95 it costs to download it):