If there is one rule in predicting what will happen in the housing market, it's that strong job growth drives strong real estate demand. This is why the Austin market was red hot during the tech boom and why the market was stagnant during the tech bust -- even as real estate prices soared in the rest of the country. And it is one of the main reasons that the Austin market has stayed so strong in 2007, even as national prices decline, interest rates continue to spike, and the sub-prime crisis unfolds.The good news is that job . . .