Inventory levels declined slightly to 12,900 listings after the big drop last week:

Many readers submitted comments questioning the validity of last week’s inventory plunge, so I tried to address them in this comment. If any readers have additional ideas, knowledge, or insight about the IDX/MLS relationship and their respective data management processes, I would love to hear from you.
Prices also stabilized somewhat over last week, with some divergence between median and average asking prices beginning to appear:

The overall year-end inventory decline is still occurring at most price levels:

and the remaining flippers continue their march into trouble:



To put the year into perspective, I would like to share some inventory data I've been collecting since June 2005. It is for Sacramento County only, but I think helps illustrate how exceptional 2006 was from an inventory point of view:

As you can see, the 2006 run-up completely dwarfed 2005 in both scale and breadth. Put another way, inventory levels in December 2006 are nearly the same as levels in August 2005.
For the true data junkies out there, here's the inventory change-per-day graph for 2006:

Both the weekly Saturday increases and monthly drop-off patterns are easy to pick out here.
From just these two graphs, it's easy to see why the latest drop in inventory is not a "hopeful sign" that buyers are returning, but just a seasonal pattern.
We broke 15-year-old inventory records, but prices remained high by any measure. We also saw flippers start to take their leave from the market, with those that remained getting further into trouble. Average and median asking prices began to drop as resellers and new house builders began to compete in earnest. I think it is safe to characterize the 2006 housing market as a market in transition, with many signs pointing to further price declines and more record inventory.
Predictions
I think the big 2007 housing story will be the rising foreclosures and bankruptcies due to ARM adjustments. I also think at least one, or possibly two major mortgage lenders will collapse due to forced buy-backs and increases in default. Ameriquest is my top choice, but Countrywide, Washington Mutual, and H&R Block (Option One) are top contenders.
Finally, I would like to thank everyone who made this site a success: Agent Bubble, JR, Lander, Patrick, Gwenster, and all the other bubble heads. If it weren't for your encouragement and feedback, I would have quit a long time ago.
Let's keep it rolling through 2007!