Nah, mine doesn't shake. It's pretty damned smooth compared to some of my other cars.

In my experience, vibrations like the ones you've described are the result of:

- Improperly balanced tires
- mismatched tires
- tires with extremely low sidewalls (little or no shock absorbtion)
- Improper tire inflation
- Bent or damaged wheels (hit any nasty potholes or curbs lately?)
- front end damage
- cars with frame damage (buy your cars used?)

If you're really sensitive to it, I highly recommend getting your tires balanced with every rotation.