I've wished there was a way to view the current temperature on my HomeScreen. Especially in our cold winters. Up till now the only way was with a jailbroken iPhone. Now its possible without jailbreak.
Damaged or broken motor mounts are arguably the most serious cause of engine vibration. CarsDirect.com suggests that a driver shift between drive and neutral while the vehicle is sitting still. If the vibration lessens while in neutral, the motor mounts may have sustained damage.
The cause is often the same as this vibration sensation that is not reflected in muscle activity: some kind of pinching of a nerve as on a bone can cause this sensation. It can also be caused, if there is no pinched nerve, by a problem in a nerve going to your foot--a damaged nerve can send a signal like this.