I have a friend who worked in Tennessee for a few years and then moved to Alabama after she found a new job. Her old employer sued her for $15,000 because she did not complete a major project before she left. The company lost the client because of her, and they wanted to get their money back some way. Federal personal jurisdiction came into play in this situation.
Because she had already taken up residence in Alabama by the time the company filed the suit against her, a federal court heard the case. They determined that she only had to pay back $7,000 because she had given the notice required in her original contract.
The only reason she had to pay any was because of a clause stating that any projects left unfinished when an employee left had to be completed long distance via phone and email, and she had failed to make arrangements for that.