Did you know that using combination of the Windows Key + any letter key that is not already assigned to a shortcut, yields a search that starts with that letter you pressed?
Windows Key + O: Use this Keyboard short to stop the screen rotation. You can lock the screen where you want it. This is particularly useful on Windows 8 tablets when you’re reading while reclining to keep the screen from rotating.
Windows Key + Z: This brings up the application bar when you’re using a Metro App. If you’re using a mouse and not touchscreen, this is the simplest way to bring the App’s options. In a Metro-style application, right clicking also bring up the app bar
Windows Key + L: As with all other versions of Windows, this keyboard shortcut lets you immediately lock your computer.
Windows Key + E: This shortcut does two things: It returns you to the classic desktop, and launches Windows Explorer for you.
Windows Key + C: Brings up the Charms bar quickly.