List of Windows 8 Shortcuts
Windows key: Switch between Modern Desktop Start screen and the last accessed application
Windows key + C: Access the charms bar
Windows key + Tab: Access the Modern Desktop Taskbar
Windows key + I: Access the Settings charm
Windows key + H: Access the Share charm
Windows key + K: Access the Devices charm
Windows key + Q: Access the Apps Search screen
Windows key + F: Access the Files Search screen
Windows key + W: Access the Settings Search screen
Windows key + P: Access the Second Screen bar
Windows key + Z: Brings up the App Bar when you have a Modern Desktop App running
Windows key + X: Access the Windows Tools Menu
Windows key + O: Lock screen orientation
Windows key + . : Move the screen split to the right
Windows key + Shift + . : Move the screen split to the left
Windows key + V: View all active Toasts/Notifications
Windows key + Shift + V: View all active Toasts/Notifications in reverse order
Windows key + PrtScn: Takes a screenshot of the screen and automatically saves it in the Pictures folder as Screenshot
Windows key + Enter: Launch Narrator        
Windows key + E: Open Computer
Windows key + R: Open the Run dialog box
Windows key + U: Open Ease of Access Center
Windows key + Ctrl + F: Open Find Computers dialog box
Windows key + Pause/Break: Open the System page
Windows key + 1..10: Launch a program pinned on the Taskbar in the position indicated by the number
Windows key + Shift + 1..10: Launch a new instance of a program pinned on the Taskbar in the position indicated by the number
Windows key + Ctrl + 1..10: Access the last active instance of a program pinned on the Taskbar in the position indicated by the number
Windows key + Alt + 1..10: Access the Jump List of a program pinned on the Taskbar in the position indicated by the number
Windows key + B: Select the first item in the Notification Area and then use the arrow keys to cycle through the items Press Enter to open the selected item
Windows key + Ctrl + B: Access the program that is displaying a message in the Notification Area
Windows key + T: Cycle through the items on the Taskbar
Windows key + M: Minimize all windows
Windows key + Shift + M: Restore all minimized windows
Windows key + D: Show/Hide Desktop (minimize/restore all windows)
Windows key + L: Lock computer
Windows key + Up Arrow: Maximize current window
Windows key + Down Arrow: Minimize/restore current window
Windows key + Home: Minimize all but the current window
Windows key + Left Arrow: Tile window on the left side of the screen
Windows key + Right Arrow: Tile window on the right side of the screen
Windows key + Shift + Up Arrow: Extend current window from the top to the bottom of the screen
Windows key + Shift + Left/Right Arrow: Move the current window from one monitor to the next
Windows key + F1: Launch Windows Help and Support

PageUp: Scroll forward on the Modern Desktop Start screen
PageDown: Scroll backward on the Modern Desktop Start screen
Esc: Close  a charm
Ctrl + Esc: Switch between Modern Desktop Start screen and the last accessed application
Ctrl + Mouse scroll wheel: Activate the Semantic Zoom on the Modern Desktop screen

Alt: Display a hidden Menu Bar
Alt + D: Select the Address Bar
Alt + P: Display the Preview Pane in Windows Explorer
Alt + Tab: Cycle forward through open windows
Alt + Shift + Tab: Cycle backward through open windows
Alt + F: Close the current window Open the Shut Down Windows dialog box from the Desktop
Alt + Spacebar: Access the Shortcut menu for current window
Alt + Esc: Cycle between open programs in the order that they were opened