[MichiganMat]

Most (all?) Bluetooth functionality in cars these days only supports cellphone headset functionality (mono audio) and is really not suited for stereo quality audio. I've seen a few aftermarket kits that support stereo protocols but then you've got to find something that will stream audio to it (iPod attachment?).

Bluetooth actually is an umbrella marketing/branding name for a broad range of "profiles" (functionalites) that most devices only support a subset of. Be careful when you buy Bluetooth devices, if they don't both support the same profiles they won't work together.