The Russell Sage Foundation and the Century Foundation hosted a conference on the financial crisis on Friday, April 13, 2012. Federal Reserve Chairman Ben Bernanke delivered the keynote address. A clip of his speech is available here.
Since Bernanke has never before acknowledged any fault on the part of the Federal Reserve in helping to cause the credit crisis, his speech on what did cause it was fairly entertaining.
Afterword: As always the questions were the more interesting part, especially the one where the idea was directly put to him that the policies of the Fed helped create the financial crisis. Of course, he disagreed.