The below is a new feature soon to be out in cars from Microsoft, as it stands the biggest feature is not HD radio but Bluetooth/MP3 capability, and I'm sure WIFI will be the next boost for what consumers will listen to and 'HD' radio is not it!
http://www.lincoln.com/extras/news_..._SYNC_MKZPromo_LNews_20071015#personalization
Radiopilot
http://www.lincoln.com/extras/news_..._SYNC_MKZPromo_LNews_20071015#personalization
Radiopilot