I'm having very similar problems. I have an HS810 headset. It pairs fine with my PB (1.5 GHz, built in BT). However, it does not show up as an option in the Sound preference panel. I also have an HS850, one of the new headsets with BT 2.0. That one pairs fine, and does show up in the Sound preference panel. However, the performance is at best inconsistent. When I use it with Skype, about half the time it works OK, and the rest of the time it crashes the program, forcing me to do a forced quit. Similar behavior when I try to use it with iChat.
Both headsets worked flawlesly under Panther.