BusinessWeek's Hot Property blog warns that home sales will dry up when the $8,000 tax credit goes away:Just when the home building industry seemed to be bouncing back, news from California raises troubling questions. The California Building Industry Association says its members reported a significant drop in traffic to their developments in July because the state stopped taking applications for a $10,000 tax credit for new home buyers.The $10,000 credit was authorized by the state legislature last February as a way to jump start California construction...