Cheers.. Just been looking in my car (March 2004 E Class Wagon) as I thought I'd better double check there's no aux input in the glovebox (I have Audio 20 not COMAND so I don't think so). There is a circular hole, covered by trim, at the top/centre of the glovebox. Is this where an input would be? Don't want to start ripping trim out but I'm curious if it may be there and just covered up.. Anyway, assuming it isn't, the icruze looks interesting..as does the solution at
www.mp3yourcar.com This purports to be compatible with 2004 E Classes, although I'm not sure if the US standard E Class Audio is different.. I've fired off an email to check.