Look who's bailing out Wall Street

Devastated by tightening credit markets and the mortgage mess, Wall Street firms have sent out an S.O.S.

Their cries have been answered in large part by overseas investors, which have agreed to inject billions of dollars into America's biggest banks.

The rescue effort has been led by investment funds run by foreign governments, also known as sovereign wealth funds, which have forged a string of deals in recent months.

With the U.S. economy limping along, expect more deals. Follow these panels to track the money trail.