Well, the highly-desirable areas typically aren't affected by the crazy mad-rushes and downturns very much. That's because there's only a limited supply of these homes and a limited supply of buyers who can afford such places. As such, the prices of these homes seem to be much more steady because regardless of what the economy looks like, there will always be a small group that will buy these homes.
In my area, these are the $1mil+ homes that have appreciated at the normal inflationary rate of about 7-8% the past 10-years. This is about 1/2 of the appreciation of the 1st-time median-level homes, which saw increases of double the historic rate and doubled in just 5-years instead of 10.
However, in the past couple months, median-prices have dropped by 12%, yet the $1mil+ homes have only dropped by 1-2%. It's the naive 1st-time buyers that are over-extended with interest-only ARMs that are gonna take the hit the most.