Yesterday I broke down and bought a Motorola HS820 Bluetooth headset for my cell phone. I haven’t used it much, but so far I like it. It’s lightweight and comfortable, and being able to leave my phone on the counter and walk around while talking is nice.
Additionally, I just discovered that I can use it with my computer, and therefore with iChat, etc. I had to update the Bluetooth firmware on my Powerbook first, but after that it connected right up. I was able to use it as a speaker for iTunes (though a very poor speaker). I have not yet tried using it as a headset for iChat but plan on giving that a try sometime.