Forte Antonio and Pesce Giovanni have just released their survey of economists on the causes and consequences of the current financial unpleasantness. I'll update with a link once the paper's up on REPEC. 772 economists, academic and otherwise, answered the survey at the end of 2008. Results on causes of the crisis, split by respondent location:
Pretty easy to quibble about whether the housing market bubble ought to be counted as a Fed Reserve problem or a market problem, but as Tyler points out, nobody forces you to put the bananas on your roof even if they're subsidized.
The more depressing results are here.
Crisis is the health of the state.