With unemployment high and jobs scarce, work is hard enough to find. But in today's economy, there's an even bigger barrier for some: their home. Many people can't afford to sell their homes; as many as one-third of homeowners owe more than their home is now worth, and there are few buyers. Americans who once expected mobility now find themselves grounded, with their careers and lives fixed in place. They can't move to better job markets without taking a huge financial hit.