you can buy an iphone dock adapter set - 3 of them for $9 or so. i bought a set to put in my ipod hifi and universal dock when i use my iphone with them (yeah, i know it's not necessary, but i wanted them anyway).
the ipod hifi remote cannot control the iphone. my remote works perfectly with my ipods, but does absolutely nothing with my iphone when i'm playing music or podcasts on it.