I will add windows METRO STYLE ONLY shortcuts here as I discover them
WinKey + C = Quick Start menu (Very useful)
WinKey + D = Go to Desktop
WinKey + F = File Search
WinKey + I = Preferences/Settings for currently displayed app, ALSO has useful Quck Menu
WinKey + W = Go Directly to settings
WinKey + Y = Preview Desktop
WinKey + Z = Show hidden menu (In Internet Explorer 10 this also shows all open tabs)
Typing in Metro mode will automatically begin an app search
Moving the mouse to the left end of the screen will preview the next open app, to choose a different app click/hold, pull out to right a little and return to edge then back out again to scroll through open apps all while holding the mouse down.
To load two applications side to side, select the app you want to load then drag it to the right edge of the screen and release.