I have the Sony Xplod head unit with bluetooth that works great with my Centro. Right now, I can redial with the blue tooth button, but that's the only auto dialing I can do, because I don't have a voice dial app installed on centro.

Has anyone gotten an after market car blue tooth working that worked with prior Palm device?

I saw the review posted earlier, but his was an fm transmitter -- mine is not a transmitter; the blue tooth works directly through the stereo system.