AP on the Monster Crash:

In 2005, faced with ominous signs the housing market was in jeopardy, bank regulators proposed new guidelines for banks writing risky loans. Today, in the midst of the worst housing recession in a generation, the proposal reads like a list of what-ifs:
_Regulators told bankers exotic mortgages were often inappropriate for buyers with bad credit.
_Banks would have been required to increase efforts to verify that buyers actually had jobs and could afford houses.
_Regulators proposed a cap on risky mortgages so a string of defaults wouldn't be crippling.
_Banks that bundled and sold mortgages were told to be sure investors knew exactly what they were buying.
_Regulators urged banks to help buyers make responsible decisions and clearly advise them that interest rates might skyrocket and huge payments might be due sooner than expected.
Those proposals all were stripped from the final rules. None required congressional approval or the president's signature.

Federal regulators were especially concerned about mortgages known as "option ARMs," which allow borrowers to make payments so low that mortgage debt actually increases every month. But banking executives accused the government of overreacting.

Plenty of good quotes here to incriminate the guilty, but this one is my favorite: