Magnetic active suspension

There is already semi active suspension system on the market (adapts the damping by changing viscosity)

http://www.gizmag.com/go/5752/

And the active one - linear electromagnetic motor is installed at each wheel of a vehicle equipped with a Bose system. The control algorithms operate by observing sensor measurements taken from around the car and sending commands to the motors.

http://www.youtube.com/watch?v=IQ1eKddstxM
http://www.bose.com/controller?url=/automotive/bose_suspension/the_system.jsp
http://www.tue.nl/en/research/strategic-area-smart-mobility/projects/bmw/

My offer probably not better, however may inspire something more:

The idea is similar to Bose system, but instead of circle magnets (linear motor magnets) here are the narrow coils (or coil in coil for stronger power). I assume that such direction can be more efficient (not sure). The
internal part 1 has channel for liquid to work as basic mechanical in emergency. The first layer of coils 2 work as stator or base for internal one. The second circle of coils form another base - now for the first one, creating folding cup like model saving the vertical space.
The number of coils in a circle may be more than 4. They not only support the vertical movement, but rotate the axle - that could be useful for cars with minimum curve radius (bus, forklift...)