I don't know of a way to e-mail Apple my suggestion directly, but this is a pretty major Mac forum so I figured I'd post here, get input, and maybe get noticed.
I just got my iPod Touch and am loving it. I just went to sync some photo albums and noticed that my folder structure was lost. I think that for organization purposes, we should be able to have nested Photo Albums.
My example: "Ireland Vacation" has "Dublin" "Galway" "Waterford" all split out. On the phone, they are all mixed alphabetically instead of the separate slideshows I'd like. And while I realize I can just make them all albums at the top of My Pictures, it messes up the organization of my PC.