This is good article in Newsweek
Here's a snippet
Home prices could sink an additional 25% over the next two or three years, returning values to their 2000 levels in inflation-adjusted terms. That's even with the Federal Reserve's half-percentage-point rate cut on Jan. 30
While a 25% decline is unprecedented in modern times, some economists are beginning to talk about it. "We now see potential for another 25% to 30% downside over the next two years," says David A. Rosenberg, North American economist for Merrill Lynch (MER), who until recently had expected a much smaller slide.
Shocking though it might seem, a decline of 25% from here would merely reverse the market's spectacular appreciation during the boom. It would put the national price level right back on its long-term growth trend line, a surprisingly modest 0.4% a year after inflation. There's a recent model for this kind of return to normalcy after the bursting of a financial bubble. The stock market decline that began in 2000 erased most of the gains of the boom of the second half of the 1990s, leaving investors with ordinary-sized returns.