If you're looking for a Bluetooth speakerphone for your car that does double-duty as a speakerphone for your desk, check out Tekkeon's new ezSpeak Portable Bluetooth Speakerphone. It lists for a reasonable $79.95 and comes with a car charger and a visor clip.
The ezSpeaker has a digital display that shows caller ID, call status, volume level and low battery. It has a DSP that offers echo cancellation and noise reduction and has 10 hours of talk time and 220 hours of standby. The speakerphone has a Bluetooth 1.2 radio and it supports last number redial, voice dialing and conference calling (if supported by the phone).