iOS4 Bluetooth Headphone features

After finally updating my iPhone 3G to iOS 4 Seed, I began to notice little feature enhancements related to the Bluetooth headphones. I have a pretty generic bluetooth stereo headset with microphone.

1) Ring tone played in the headset.
No longer do we need to hear the default ring indicator built into the headset, we hear the iPhone ringtone.

2) iPhone Volume control effects headset volume
This was a surprise and I did not even realize that it was working. This is one of those things that you expect to work.

What is still not working is "Skip Forward/Backward". Maybe this will be available in the release version of the OS.