Global Menu Shortcuts
Fn-Arrow Keys is the equivalent of the Home/End and PageUp/PageDown buttons on a PC; Left-arrow and right-arrow for Home and End, Up-arrow and down-arrow for PageUp and PageDown.
Fn-Delete deletes one character to the right of the cursor, same as forward-delete on a PC.
Ctrl-F2 moves focus to the Menubar. You can use the arrow keys to select menu items and enter to apply them.
Ctrl-F3 moves focus to the Dock. You can navigate around with the arrow keys to select applications and enter to switch to them.
Ctrl-Cmd-D displays a popup dictionary for a selected word. Just hover over the word with the cursor and hit the shortcut. Useful for quick definitions.
Cmd-Q quits the current application.
Opt-Cmd-Escape opens the force quit menu where you can selectively force quit applications.
Holding Shift-Cmd-Opt-Esc for three seconds force quits the frontmost application (Leopard and Snow Leopard only).
Ctrl-Eject opens the shutdown/restart/sleep dialogue.
Ctrl-Shift-Eject puts the display to sleep immediately.
Opt-Cmd-Eject puts the computer to sleep immediately.
Ctrl-Opt-Cmd-Eject shuts down the computer immediately.
Enter renames selected file.
Cmd-O opens the selected folder in the Finder.
Shift-Cmd-N creates a new folder in the current directory.
Cmd-J opens the View Options panel, where you can tweak settings for how a specific folder appears in the Finder, such as icon size.
Cmd-I opens the Get Info panel for the selected item.
Cmd-Delete sends selected file(s) to Trash.
Shift-Cmd-Delete empties the Trash with confirmation.
Shift-Opt-Cmd-Delete empties the Trash without confirmation.