I just received my new Motorola H730 Bluetooth Headset and hooked it up to my Blackberry. The connection was easy and I am enjoying getting to know it better. My previous Bluetooth Headset was a Plantronics brand which was real comfortable and easy to use - it lasted me for about 6 years and was very reliable.
This new Motorola unit is real nice and it will tell you by voice that a call is coming in - on my unit it announces "incoming call on phone one" - with that announcement, I am assuming that I might be able to connect it to another phone simultaneously. I will have to read the instruction booklet, but so far I like it!