while this is not for an ipod specificly ( since i dont use an ipod) i purchased the XCarLink USB MP3 Player Integration Kit for Mazda
http://www.therpmstore.com/product_i...roducts_id=141
allows you to plug a head phone jack from an mp3 player in, or either a usb stick or sd card into it to play mp3s off of. i use it with a 4 gig sd card i put in there, one downside is you can only have up to 600 songs,( it acts like theres 6 separate cds in with up to 100 on each i ususally put songs of diff genre in each virtual disk"
all the steering wheel controls work, but another downside is it will not display the name of the track just a number. overall it works great for what i wanted.
i routed mine to the glove box, and was planning on running a head phone jack down to the center console at a later time