I have that h/u with the ipod adapter. Its easy to fit, the renault wiring just plugs straight into the h/u iso blocks. I fitted my ipod interface in the glove box and fed the wires through the hole where the glove box lid locks into, the ipod can then be plugged in and hidden away in the glove box.
Alpine do an interface for the display and remote control. Its £60 from Cel-direct, you need parts KCE-940B and KWE-942E. There is yellow iso plug that connects to this interface behind the h/u. As already said this does not work with recent 05 models. There are other interfaces that are cheaper (about £30 but they show much less info on the display that the apline one). The buttons react slightly differently from renault markings on the remote with alpine adaptor, but you get all the functions you need. There is also an older version of the apline interface which requires the dash to be taken off to fit, not the one you want unless you fancy it.
The only problem i have found which has been mentioned is that it takes a while to scroll through the songs and the adapter will only show a certain number entries in the ipod menus. Usually not a problem when searching from the album menu but if you go to song or artist you can loose the last entries if you have too many. I find it best to make playlists as its much faster and just put it on shuffle.
A friend brough an adapter from Cel-Direct that changes the Alpine CD changer lead into a headphone input so you can just plug that into the ipod. Much faster and you can skip through tracks much more easily, only the ipod cannot be controlled from the h/u. Cost £22 rather than £70 though.
