People are coming up with a lot of great products made of carbon fiber composites. The nature of these products makes the use of composites a requirement.
I found an interesting video of a very specialized carbon fiber bike. Called the Yike Bike, it is basically an electric scooter that allows for urban transportation. The bike folds into a small and portable unit that can be easily carried and stored.
The use of carbon fiber is necessary due to the requirements of light weight and high strength. It is necessary for this scooter to support and transport people of various size and weight. The bike also must be lightweight so that it can be easily carried aboard trains and into office and apartment buildings.
This unit is definitely a feat of engineering, and is available to the public in the Summer of 2010. It is pricey, but fills a unique role for those that require urban transportation.