Attempted to use the Apple Bluetooth interface cable with my iPhone 4 yesterday without success.  No power up, no connecting my Apple Bluetooth headset, nothing.  I’m going to try some more tricks later, but it looks like this one’s in the books which is sad because it’s awesome to see the charge levels of both the iPhone and Apple’s Bluetooth headset all on the lock screen.   Even better, pairing the two is as simple as plugging them into the cable.