I was able to register my Jabra BT250v. You also have to make sure you go into the "Adjust Audio Settings" screen and set the newly registered headset as the input and output device. If you dont see the Blutooth Headset in the lists of devices, then you didnt successfully register the device. Try to reregister and go through the steps again. Once you set the BT headset as the Input and Output device, the little status bar on top of the Audio Settings screen will register your voice so you can verify the PS3 actually hears you.
With all this said, I still havent been able to use it in game. Ive tried it on Socom: Combined Assault and Socom doesnt see it. I havent tried using the mic in any of my PS3 games yet. Just havent had time.
Does anyone know what PS3 games actually use a mic?