For the benefit of Lippy and everyone else, this is what we want and what we're trying to do...
i-trips and other FM transmitters work, but the sound quality is pretty rubbish and ultimately becomes frustrating. Harman & Kardon (H&K) have a product called 'drive and play' which allows ipod connection and control through use of a seperate screen (which can be put anywhere on the dash) and a jog/scroll wheel, not unlike the one we have in the EX's for nav control. Essentially the info on the screen is the same as that on the ipod itself and the scroll wheel thingy makes it easy to control while driving. Should work with the volume and possibly 'skip track' feature on the steering wheel. Below is a link to their site showing the product in operation and some pictures are posted below.
http://www.harmankardon.com/drive-1/default.aspx
The complication is with the stereo unit, in that it needs a special cable (connects2) to connect it to the H&K system and basically we're trying to get said cable and see if it does indeed work! I think the little screen looks the part and as things stand at the minute, if it works, it will be the best ipod solution.