In the early 1990s, as Southern California suffered its worst recession in half a century, freeways were crowded with moving vans headed to Nevada, Arizona, Utah and points east, filled with people hoping to find a better life elsewhere. These days, there's no recession. California's economy is growing at roughly the same pace as the nation's. The statewide unemployment rate is at historic lows. There is no major wave of factories being shut down. But once again, more Californians are moving out than are coming in from other states. This time they're not looking for jobs. They just want a...