From Karl Russel and Shan Carter of The New York Times is this animated tree map to show the shrinking, and eventual partial regrowth, in market value of this country's largest financial groups.
The market peak was in October 9, 2007. With the exception of a few months since then, most companies decreased in market capitalization. They then hit a low in March 9, 2009, and have slowly regaining what they lost.
At the peak, the value of the 29 firms was $1.87 trillion. As of September 11 of this year, their total value was at $947 billion. Clearly, there is still quite a way to go before they're back to where they began.