Housing.com Blog - I have met this blogger personally. Amicable fellow. Very solid blog.
The Housing Bubble Blog - Ben Jones' blog is the most visited. It rocks!
Another F*CKED Borrower - Relatively new blog that focuses on the lending side of the bubble. He is a mortgage broker who lives in Southern California. Wonderful perspective.
The Bursting Bubble Forums - Forums to discuss the housing bubble. Yipee!
Bubble Markets Inventory Tracking - Keeping the stats. Keep it up.
Marin Real Estate Bubble - Reporting from suburban San Francisco. Provocative.
Northern New Jersey Real Estate Bubble - Solid. Updated often. Suburban NYC.
There are other terrific bubble related sites out there. :-) The other great sites will be featured in the future.