Aliph make a pretty good Bluetooth headset, I've heard, but I think I respect them just as much for their clever marketing of the Jawbone. First they let CES attendees trade their old Bluetooth headsets for a Jawbone. Now they're giving a $20 discount on the new Jawbone to anyone who was recently gotten a ticket for talking on a cell phone without a headset. Clever. They've even tied their site into what I presume are the public ticketing records for each state to verify that you actually received a citation.
I'm reading a pre-press copy of Tom Vanderbilt's fascinating book "Traffic" about cars and how they shape us individually and as a society. (More on the book soon, including an interview with Mr. Vanderbilt.) One point of interest from the book regarding Bluetooth, however: some studies indicate that even using a Bluetooth headset doesn't greatly diminish accidents. The problem isn't just noodling with the phone controls or looking away from the road, but simply being occupied with anything else but driving.
Still, a headset is better than no headset, I figure.
Jawbone page (there's no direct link) [Jawbone.com]