"Fannie Mae and Freddie Mac are in trouble. That much even the occasional reader of newspaper headlines knows. But who are they, exactly, and what have they done to prompt the federal government to announce it was standing by with a possible multibillion-dollar bailout?"
Loan Performance Home Price Index
"The First American CoreLogic LoanPerformance Home Price Index reflects a broad range of mortgages nationally. According to this index, home prices have fallen 30% from their peak in 2006. Notably, home prices have shown signs of stabilization in the recent data, according to this and other home price series."