You know, wireless earphones aren't the only use for bluetooth on a PMP...
I really wish there was a feature similar to the samsung P2, where there was bluetooth callthrough. Sync your music player with your phone, and when you got a call, it alerted you on your music player and you could take the call right there, with a built in mic. The player acts as the bluetooth headset. You could even initiate calls from there too.
Great if you use noise cancelling headphones and you dont carry your phone somewhere that you can feel it viberate (like a backpack, holster, whatever).
I don't care a bit for bluetooth headphones... but the ability to answer my calls on my media player would be nice.