@Medinoc: "To you, I recommend using the old-fashioned way to close a window: Double-clicking the system menu, which is still of infinite width and height (good luck if you're using Firefox, which no longer has a system menu in the upper-left corner."
Which no longer works in Windows 8 for any application, as I quickly discovered. All the corners seem to be tied to doing something with Metro now. (Clicking the "X" in upper-right pixel still works though).