America's house price time bomb :

With the American housing market in its worst crisis since the Great Depression of the 1930s, President Bush is expected to sign into law a massive new government intervention designed to slow the slide.

Banks in the US could end up owning ever more houses
The intervention would come as a little known quirk of US law threatens to drive down house prices even faster.
Faced with seemingly never-ending falls in the value of their properties, some American home-owners are taking radical action; they are choosing to walk away from homes and their mortgages.
In May 2006, at the height of the housing boom, Karen Trainer bought a $500,000 apartment in California - with money borrowed from her bank.
By this year, Karen still owed $500,000 on her mortgage, but her apartment was worth $200,000 less.
So she was deep in negative equity and, to make matters worse, the interest rate on her loan was about to increase.
"I thought 'this is crazy'," Ms Trainer says. "It just does not make financial sense."