Martin Aircraft in New Zealand built the prototype that's closest to allowing you to jet to work. A fan-propelled, rotary-engine-powered jetpack with 200 horsepower, the Martin Jetpack (not pictured) keeps steady altitude even if riders' hands leave the controls for a sip of coffee. "It's ridiculously easy to fly," says Mike Read, VP of sales at Martin. Its range? Thirty miles. Martin plans for the military to test it before consumers whiz it around.