Saw an interesting video, where a very impressive case was made for Boise Idaho being the area where the first evidence of a housing bubble should manifest itself.
He didn't actually predict a bubble soon, but did advise not investing there for the next couple years.
In another video, he noted that the area most hit by the 2006 drop was Phoenix, where prices fell 50%, and took longer than the rest of the country to come back.
Just thought it was interesting, he wasn't really trying to sell anything, but I am sure he works for some sort of investment company, although he didn't mention it.