A feature that should have been implemented since day one. Sadly, still no word on if this will ever be supported on the first gen iPhone. My guess is they will wait to put it on the second gen. the same time they release a Apple stereo bluetooth headset.
We knew this before the first one was released. ONce they released the specs and it didn't show the A2DP bluetooth profile we knew stereo bluetooth was out of the question. Not really sure why Apple left it off; it seems like a natural fit for an ipod type device.