First, for the softmodders, the directory for skins, if setup using default settings, is E:\Skins. That made all the difference in the world for me! So if you are having problems, and cant see ANY skins other than the original Evolution X skin, try dropping the skins folder into the E: drive rather than C:
I am ALSO looking for more information, about adding files, be it skins or anything else, to the xbox via a CD or DVD. If anyone could help with this, it would make it much easier for me to upgrade my father-in-laws softmodded box, without having to drag it to my house.