Please excuse my noob-ish excitement
Just had a Nokia CK-100 installed in my standard Civic ES, and its simple but I like. The iphone4 sits charging in a cradle just to the right of the gear lever, then there is a single dial button (down by the fag lighter in my car). The mike of course is up by the mirror. It pairs up to the phone as soon as you start the engine and the button glows blue. Make/receive a call - it goes green. The button is also a volume control for the phone. If you use the phone or play ipod music the radio mutes automatically. And if you hold down the button, the iphone4 flips to voice control, when you can either say music stuff like 'play' or 'next' or 'whats playing?' or phone people in your contacts by calling 'call Fred' etc. £200 all fitted, not bad considering the local dealer wanted +£300 for the standard ipod cable.