The only wireless headsets that I'm aware of that works with the treos are the Jabra Free speak and Plantronics has one. They work on bluetooth technology and both vendors have one designed to work with non-bluetooth phones (as is the treo).
If interested make sure you get one compatible w/nokia 3000/8000 series phones as the treo uses the same type 2.5mm 4 conductor mini pin
I am wondering about buying the Treo and using the USB bluetooth interface. Does anyone know if the USB will handle the bluetooth interface properly on the Treo?
I want to use the wireless headset with the phone and the bluetooth networking to my home system. That way I have everything connected.