Windows 8 Keyboard shortcut

 Windows logo key+spacebar Switch input language and keyboard layout,
Windows logo key+O Locks device orientation, 
Windows logo key+Y Temporarily peeks at the desktop,
Windows logo key+V Cycles through toasts,

Windows logo key+Shift+VCycles through toasts in reverse order,

Windows logo key+Enter Launches Narrator,
Windows logo key+PgUpMoves Metro style apps to the monitor on the left,
Windows logo key+PgDown Moves Metro style apps to the monitor on the right,
Windows logo key+Shift+. Moves the gutter to the left (snaps an application),
Windows logo key+. Moves the gutter to the right (snaps an application),
Windows logo key+C Opens Charms bar,
Windows logo key+IOpens Settings charm,
Windows logo key+K Opens Connect charm,
Windows logo key+H Opens Share charm,
Windows logo key+Q Opens Search pane,
Windows logo key+W Opens Settings Search app,
Windows logo key+F Opens File Search app,
Windows logo key+Tab Cycles through Metro style apps,
Windows logo key+Shift+TabCycles through Metro style apps in reverse order,
Windows logo key+Ctrl+Tab Cycles through Metro style apps and snaps them as they are cycled, Windows logo key+Z  Opens App Bar