On the subject of electric motorcycles, I noticed this Specialized Turbo Bicycle (available only in Europe at this point) that starts to blur the lines between bike and motorcycle.
Unless your name is Fabian Cancellara, it is doubtful you can sustain 28 mph on your bicycle for more than a couple of seconds (if that long). The Specialized Turbo will do 28 mph on its own, or you can peddle on your own, or you can combine your pedaling with the force of the motor.
The motor is part of the rear hub (can you get more efficient than that?). The battery is integrated in the frame, providing for a sleek look, and it can be charged in two hours. This design would also facilitate future battery upgrades.
180mm brake discs are found both front and rear, while the rear brake can also regenerate the battery. Video below makes all of this look like fun, although if you follow this link you will find that the machine is quite expensive. For those of you who already ride bicycles for exercise or to commute, this is an interesting machine. For those of you simply interested in motorcycles, it is still interesting because it shows how simple and light these machines could be someday (with greater range and speed, of course). By the way, I was unable to find any reference to range on the Specialized website. Let me know in the comments section if you see anything. My understanding is that it will not be available in the United States because it is too fast be classified as a bicycle, and would require a license.