Another alternative
USA Spec makes a nice interface that can work with many OEM radios: http://www.usaspec.com/ipod.html, and they are shipping a cable that is compatible with the iPhone 3G as well as all current iPod models. I've paired mine up with my VW Passat and the OEM Monsoon head unit and a holder from Brodit similar to the post above (check out proclip for tons of options:http://www.proclipusa.com/choosecountry/choosecountry.aspx). The really nice feature is this interfaces with the CD changer axillary port of the HU, giving me volume and track skip control from my steering wheel controls, and I have full control from the front of the iPod as well. If you are willing to get into your dash on your own, you can make a pretty clean custom install that is cheaper than the speckdoc products mentioned thus far.
USA Spec makes a nice interface that can work with many OEM radios: http://www.usaspec.com/ipod.html, and they are shipping a cable that is compatible with the iPhone 3G as well as all current iPod models. I've paired mine up with my VW Passat and the OEM Monsoon head unit and a holder from Brodit similar to the post above (check out proclip for tons of options:http://www.proclipusa.com/choosecountry/choosecountry.aspx). The really nice feature is this interfaces with the CD changer axillary port of the HU, giving me volume and track skip control from my steering wheel controls, and I have full control from the front of the iPod as well. If you are willing to get into your dash on your own, you can make a pretty clean custom install that is cheaper than the speckdoc products mentioned thus far.