Real Estate

• Home Prices Yahoo Real Estate Home Values and Home Price Check will (maybe) tell you what your neighbors paid for their homes.  (Both use the same database.)
• Realtor.com
• HomeSeekers.com

VA Housing

• Veteran Affairs Home Loans Program sells real estate acquired through defaults on VA mortgages.  This is the top site; you have to dig a little from here to find the listings for your area.  For example, here are the listings for Northern California.

Mortgages

• Bankrate.com has current mortgage interest rates figures.
• Mortgage Almanac has helpful articles on mortgages and credit, including a directory of lenders' websites.
• Mortgage Bankers Association of America