Lurker,
I have a question. Correct anything and everything I have wrong here.
Assume you buy a home for $250,000, and put $25,000 down, and then make payments so that you get to a point where you owe $200,000 on the mortgage, with $50,000 in equity. You sell the home, and only get $150,000. Now you have a $100,000 capital loss.
You can apply that capital loss against any other capital gains you may have, but you cannot apply the capital losses against prior years capital gains. If you have no capital gains, then you can apply $3,000 a year, until you burn up the $100,000. Is that all correct, or do you handle capital losses on a primary residence differently than other capital losses?