Just a heads up here because I got ... "done" by my dealer who didn't know enough about the iPhone thing.
If you own an iPhone you need to get:
1) the bluetooth connection kit
2) the 6LF option which gives you an Aux socket with a USB socket next to it
AND (this is the bit my dealer forgot/did not know)
3) the smartphone connection kit, which allows you to use both the ipod and iphone features of your iPhone 3G or 3Gs.
If you don't order the 6NF option YOU CANNOT HAVE IT RETROFITTED!!!
4) the snap in adaptor with USB connection for your iPhone 3G
AAAHHH the beauty of technology!!!