this is pretty cool.
Ive been looking for a decent mic/speaker phone solution or some way to rig up so when i call someone in the car the voice dosent come out my car speakers (my speakers are superloud even on low).
This is basicly a standard bluetooth headset, but the formfactor fit for a car, as it connects to your headrest.

found this site looking at there other product which is a table top bluetooth headset thingy made for conference calls.

bit pricy at 150bucks though.