My buddy drives a 2004 Maserati 4200 CC, and just bought a CD Changer Emulator from these guys: CD Changer Emulators : Loudlink Bluetooth Car Kits, CD Changer adapters, - for Fiat, Alfa Romeo, Lancia, Maserati, Porsche - SSD Mp3 player with iPhone, iPod compatible AUX-in - Bluetooth Handsfree with USB Charger. It was like $150 and would take care of many of the issues with which we live. My buddy thinks the install will take about a hour and will give him hands free calling and allow him to use the existing controls to control music playback from his phone. Currently it does not look like they support Jaguar but if enough people asked they might. I have already gone down another path but thought I'd pass this on to anyone interested.

Mark