Bluetooth car audio??

Just a random thought I had...

Has no-one developed a range of car stereo head units with integrated
bluetooth yet??
I mean, more n more people buying mobile fitted car kits (whether bluetooth
or not...) - but then most of the kits still come with a speaker to fit -
and for some cars it can be a real drag to find the correct 'audio-leads'
adaptors & mute cables to re-route the sound through the car speakers.

I've got a new shape vectra sri - supposedly with telematics - spent a few
months casually lookin into gettin my Sony-Ericsson HCB30 bluetooth car kit
to use the built in telematics - no answers - still on pesky lil speaker n
mic. makes every callers first words change to - where r u?? I cant hear you
properly!!

Surely some of the aftermarket stereo manufacturers could cash in on this -
I'd rather have spent an extra £130 on a better stereo than a BT kit where I
just get told to call em back later - ...i'm not bitter though...

Rick