Another thing to add to this (to defend against the insecure knuckle-draggers that claim it is 'girly' or looks horrible) is the fact that to date all white Apple products have been made of plastic/polycarbonate, fairly cheap-looking and one-dimensional.Even more so when you consider it will look 1000 times better in the sleek opaque albino glass 'flesh'.
However, we already know the iPhone 4G casing is a sandwich of two layers of glass. Very different, much more tactile and reflective. Take a look at certain vodka bottles next time you're going through the airport, e.g. Absolut Vanilla or Chase.