My prediction: An entire industry of downloadable, DRM'd car sounds spurred on by regulation requiring cars to emit a constant sound above a certain volume.

Luckily, I plan to be the one to license the Jetson's sound and sell it for millions!

Nissan are showcasing the Leaf and installing a network of charging stations are being installed in my part of town (Lisbon, Portugal). The cars are quieter than others but not close to silent since the tyres still generate the same amount of frictional noise from the road as a regular car.

Amusing, but I really don't like when people make this complaint seriously. Reducing outdoor noise pollution is one of the best things about electric cars.