If you want to close something, how about a big red "X" If you want to minimize it how about a nice minus button? and to resize how about a grab bar that YOU CAN SEE at the corner of a window? That way you can resize multiple windows to fit on one screen. Also, why would you want a menu to take up the whole screen and obscure open programs, when you could simply have cascading menus operating off of a simple button, such as .. whoa, what a concept.. a START button?
Also, I object to EVER using the Windows key, it's too easy to hit accidentally while typing, interrupting what you're doing. Making it NOW OBSCURE THE ENTIRE screen makes me want to RIP IT OFF the keyboard even more than I ever have before (and I've ripped them off of multiple keyboards, believe me.)