Plust this is a cool chart on housing affordabilty

http://static.seekingalpha.com/uploads/2011/1/6/595019-129429337257722-Leith-van-Onselen_origin.jpg

The entire article has great data/charts

http://seekingalpha.com/article/245203-the-truth-about-the-u-s-housing-market?source=hp_wc&wc_num=3