I use a bluetooth headset with the program Skype and it works pretty well. It is not as good as the speakers or regular headphones but it works. My PB has bluetooth built in; I don't see why it shouldn't work with a USB bluetooth adapter...but I cannot be sure.
I use this headset:
http://www.amazon.com/exec/obidos/tg...s&n=507846
You can choose in system preferences to send all audio to the headset but again it won't sound as great; still works though.
Occasionally it blanks out for a second or so but this is pretty rare.
The headset I use (above) only turns on when audio is sent to it (to save battery life) so you might miss a second or 2 of sound, not sure if this is common on other headsets.
As for a bluetooth stereo headphones, I do not know about. I saw Logitech is coming out with this:
http://www.logitech.com/index.cfm/pr...ONTENTID=10540
But it's for the Ipod and I have no idea if it will work or how well.
Lastly I reccomend the prgram SoundSource, it lets you easily switch between sending audio to the headset or to the speakers/headphonejack.
Hope this helps.