Here are the new listings immediately after Easter and Passover, often the start if the spring selling season:
A good overview:
The US Housing Market in August 2014
A primer on the political situation surrounding Fannie Mae and Freddie Mac, by Charles Schwab:
Reform of Housing Giants Remains in Limbo
Who was really to blame for the housing boom and bust?
Here's an interesting viewpoint.
The destructive dream of home ownership