As financial markets retreat, the credit crisis looms, foreclosures spike, and mortgage problems persist, the national housing market is clearly struggling. In this tough environment, even the Austin market has turned negative with a year-over-year pricing decrease of a little less than 1%.While times may be rough, the truth is that bad times are relative. Despite the year-over-year drop in housing values, it turns out that at least one Austin zip code is doing well. According to Business Week, Austin Zip Code 78749 is the second fastest moving market for houses in the country. With . . .