I haven't looked into the technology behind the Bose system, but I've seen several people compare it to the new system on the Corvette and certain Cadillacs. That system uses magnetorheological fluid in the dampers, and an aftermarket system has been developed by
Carrera.
For some info on MR dampers, check out
http://www.shodor.org/~bblock/weave/website/12.html and
http://www.rodmillen.com/Mroads.htm.
I was looking for info on this stuff back when I first read about it on the new Vette, and even found a cool link on how to make your own... that's on my home computer though.