I'm running Ubuntu 12.04 under gnome-shell. When I press Ctrl-Alt-KP_Left, the active window moves to the left edge of the screen, likewise for right, up, and down. KP_5 maximises/restores the window. (Fascinatingly, moving the window to the left or right at the same time moves it down a bit each time.)
I don't like that, as it interferes with certain Eclipse shortcuts, but I can't find a place to change these settings. In gconf-editor, I navigated to
/apps/metacity/window_keybindings and found that
move_to_side_e was set to SuperKP_Left, and so on. I changed all these to disabled, to no avail (I tried logging out an in again.)
How can I change these shortcuts?