If there's one workplace trend that's unlikely to wane anytime soon, it's job-hopping. Now that most companies don't offer pensions or other such long-term incentives to stay, workers are more likely to explore their options freely without having to worry about the benefits they're giving up. Not only that, but in many cases, moving from one job to the next is an efficient means of boosting income -- something all of us could use.The problem with job-hopping, however, is that it's not so easy to pull off when you're currently employed.