Riding the Inner City Bike will definitely make heads turn. It has no chain or gears. Just a single hub with 1:1 gear ratio to push it along. However, when you see it in action, you want to get one.
Why I mentioned that it is a unicycle is because if you minus the front wheel, you will realize that it is actually behaving like a unicycle. With the front wheel and a single brake, it seems ok to ride. Some pictures of this Inner City Bikes by who else, Inner City Bikes.
It has two models. A 36-inch (Wheel size) and a 29-inch.
Here is a look at the brake.
Unfortunately, they are not for sale yet. There are more information on their website. Read how the design come about.