Maybe we'll have these in cars someday...

April 30, 2007 — The roar of jets. The shriek of car alarms. The din of traffic. All-intrusive noises can distract us from our work and keep us awake at night. But help is on the way for the restless and sleepless. A noise-negating method that thwarts vibration with vibration could be available for use in apartments, hotels and offices in five years.


http://dsc.discovery.com/news/2007/04/30/soundproof_tec.html?category=technology&guid=20070430090000&dcitc=w19-502-ak-0000