Based on Ubuntu Desktop 12.04 LTS, "super" key is the windows logo key.
Shortcuts Definitions
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System Settings -> Keyboard -> Shortcuts;
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Super(press): show system shortcut list;
Shortcuts list
Alt + mouse drag: move window (you can drag a window at any position within a window, not only at title bar)
Alt + F2: run a application in command line box
Alt + F7: move window via arrow key;
Alt + F8: resize window via arrow key;
Ctrl + Alt + Num(1~9): move window to a position
Ctrl + Super + D: show/hide desktop (minimize/show all window)
Super(tap): show Dash Home;
Super + W: show a window list, you can use arrow key to select a window;
Super 1 to 9: same as click on the launcher icon, you can lock a frequently used application on launcher and launch/activate it via these shortcuts;