What are some good shortcut keys in Mac OS X?

Here are some shortcut keys for Mac OS X 10.8, Mountain Lion. For more shortcuts, visit the Apple website.

Cmd + N	New Document or Finder Window
Cmd + A	Select All Items
Cmd + B	Bold
Cmd + I	Italicize, (In Finder) Get Info
Cmd + U	Underline
Cmd + C	Copy
Cmd + X	Cut
Cmd + V	Paste
Cmd + F	Find
Cmd + P	Print
Cmd + S	Save
Cmd + Shift + S	Save As
Cmd + Z	Undo
Cmd + H	Hide Current Window
Cmd + W	Close Current Window
Cmd + Q	Quit Application
Cmd + Option + W	Close all window in app, but doesn't quit
Cmd + T	New Tab in Safari/Firefox
Cmd + Shift + ]	Switch to the next Tab in Safari/Firefox
Cmd + Shift + [	Switch to the previous Tab in Safari/Firefox
Cmd + ` (accent)	Cycle through open windows on current application
Cmd + Tab	Switch Application
Cmd + Shift + 3	Screenshot (whole screen), saves file to Desktop
Cmd + Shift + 4	Screenshot (selected area), saves file to Desktop
Cmd + Shift + A	(In Finder) Open the Applications folder
Cmd + Shift + H	(In Finder) Open your Home folder
Cmd + 1	(In Finder) Icon View
Cmd + 2	(In Finder) List View
Cmd + 3	(In Finder) Column View
Cmd + downarrow	(In Finder) Open highlighted item
Cmd + Y	(In Finder) Quick Look
Cmd + Option + Esc	Force Quit
Cmd + Ctrl + eject	Sleep
Cmd + Shift + Q	Quit all applications and log out
Ctrl + eject	Shutdown prompt

keyboard, command