I can't find it now, but amidst the 3.3.1 kerfuffle someone blogged about what the iCar would be like. Here's what I remember from it:

If Apple made cars:

  * You'd only be able to drive them on Apple-certified roads
  * The cupholder would only accept a proprietary Apple cup
  * There would only be one pedal
  * You could have any color you want - provided it's brushed aluminium