Here's the news we've been expecting, from CNNMoney:

A record high number of homeowners faced a serious threat of foreclosure during the fourth quarter of 2006, according to a survey released Tuesday by the Mortgage Bankers Association...

Troubled mortgage holders rose across the board: The delinquency rate for one-to-four-family houses rose to 4.95 percent of all loans outstanding compared with 4.67 during the third quarter and 4.70 percent 12 months earlier.

All major loan types contributed to the increase, but subprimes and FHA loans were up the most.

OK, have a look for yourself:

   

Foreclosures_started

   

The real (bad) action, of course, is in adjustable rate mortgages (ARMs):

   

Foreclosure_breakdown

   

Meanwhile, delinquencies are still growing, though here too the problem is the ARMs:

   

Delinquencies_fixed_rate 

Delinquencies_arm

   

Calculated Risk has a map with the regional breakdown of delinquency rates, showing the concentration of past due loans in the South and Midwest. Here's more of that story, in pictures:

   

Regional_delinquency_prime 

Regional_delinquency_subprime

   

Once again, the issue is the ARMs:

   

Regional_delinquency_fr_prime

Regional_delinquency_arm_prime

Regional_delinquency_fr_subprime

Regional_delinquency_arm_subprime

   

And foreclosures?

   

Foreclosures_prime_fr

Foreclosures_prime_arm

Foreclosures_subprime_fr

Foreclosures_subprime_arm

   

There, unfortunately, you have it.

UPDATE:  Much,much more --

Jim Hamilton covers the New Century story. Calculated Risk surveys some "overlooked subprime stories."  Daniel Gross is on Contagion Watch. (Here, as well.) Nouriel Roubini reports on a report that emphasizes the non-subprime aspects of the problem.  Truck and Barter links to yet more related stories, as does Ben Jones.

Chris Dillow thinks the problem is reall in the labor markets (though Arnold Kling has his doubts about that).

Barry Ritholtz has an explanation of how Collateralized Debt Obigations (CDOs) work.

Claus Vistesen sees "the risk of severe slowdown/recession in the US mounting. Nouriel Roubini says the "credit crunch genie is out of the bottle" --just as Kash fearedMichael Mandel believes that tightening credit standards mean that "an interest rate cut would be in order as well."  But James Pethokoukis suggests it may be no more than "March Madness."