I’ve never liked those silly bluetooth headsets people leave in their ears all the time.  To be honest, it just looks a little lame, even when you are using it but especially when you aren’t.  Despite that opinion, I actually have one but haven’t used it in over 2 years which is right around when I got my first iPhone.  Well apparently, a few months ago, a jailbreak app was released that lets you route all audio through the bluetooth connection.  Now I can listen to a horrible quality version of all my music should I misplace my headphones!