The Segway Human Transporter has been around in the US for some time and you can even buy them on Amazon. Despite their relative popularity over there I am yet to see one in London. However, this could all change with their latest updates to the range. There is now an off-roader, golfing and updated starter version.
Basically the Segway is a self-propelled, two wheeled platform with a built in gyroscope (to stop it falling over) ideal for getting to and from the office. via engadget