I just test rode a bike with an internally geared hub that impressed me. It isn't geared for hauling ass like a road bike, more of a city cruiser. The most interesting aspect was that it used a drive-shaft in lieu of a chain. The resulting design is extremely clean, and rivals a fixie for elegance in simplicity while also giving you options if you live in a hilly environment. Here is a link to one for sale, the company website doesn't show it off enough...