when the dark edge theme gets ported over for Froyo you will be able to have this... just a matter of time i assume since DE was such a big hit before froyo came out! not sure if you can just have the black gmail part without the rest of the theme though?
Yeah, when I had dark edge on my 1.1, the black gmail and gtalk and mms apps were straight. They were good on my eyes, plus they just looked better. So now im waiting around for it to get ported or for some other possible options.