1.1.1 adds music over bluetooth, kinda...

[macduke]

Apparently there is an interesting new "bug" in the 1.1.1 update which leaves the blue tooth audio channel open after you exit visual voice mail, albeit with a few caveats.

From Engadget.com:

The iPhone 1.1.1 update has a hidden little surprise for y'all: Bluetooth audio streaming is now available off of your iPhone for whatever you darn please, meaning you can finally listen to music from the phone wirelessly. Oddly enough, this "function" has been unleashed by a Visual Voicemail bug that leaves Bluetooth audio on even after you've left the Voicemail interface. Of course, it's only mono audio, and the audio keeps playing out of your built-in speaker -- if you plug in headphones to cut off the speaker you'll lose Bluetooth streaming as well -- but it's nice to see Apple forking over some "should have been there in the first place" functionality accidentally to go along with all that stuff of the same ilk 1.1.1 took away from us.

Link