For the first time since the residential real estate marathon began 13 years ago, parts of the country are showing signs of exhaustion. But if you rely on the experts to declare that a particular area's bubble has popped, you may have waited too long. So how can a homeowner tell if a market is about to go bust? This may be one of those rare occasions when professionals parsing data are at a disadvantage to regular people watching the market. That's because the main driver of today's market is consumer psychology. Home prices go up as long as people...