John Resig uses this
"I wish my car accepted audio input."<p>I just used a Grom adapter to add bluetooth to my 1999 daily driver.  It doesn't have whizzy features like voice dialing and A2DP audio quality is not excellent but, for podcasts, pop music, and phone calls, it's great.<p><a href="http://www.gromaudio.com/" rel="nofollow">http://www.gromaudio.com/</a>