Mac OS X Shortcut Keys

During Startup
Hold {command} + s Start up in Single-User Mode
Hold {command} + v Start up in Verbose Mode
Hold {Shift} Safe Boot Mode - disables non essential kernel files and startup applications
Hold C Boot from CD
Hold T Boot in Firewire "Target Disk Mode"
Hold N Network Boot
Hold X Force Mac OS X startup
{command} + {option} + {delete} + {shift}

mnemonic: CODS
Bypass primary boot volume and look for other volumes with bootsectors
{command} + {option} + O + F

mnemonic: COOF
Open Firmware--Careful with this one.
{command} + {option} + P + R

mnemonic: COPR
Zap P-RAM
Miscellaneous Keys
{command} + {shift} + 3 Take screenshot
{command} + {shift} + 4

press {space} over highlighted window
Take screenshot of selected window
{command} + {option} + D Toggle Show/Hide dock
{command} + {tab} Cycle through active windows
{command} + {option} + {esc} Force Quit application
{command} + ? Open Help
"Edit" Menu Commands
{command} + Z Undo
{command} + X Cut
{command} + C Copy
{command} + V Paste
{command} + A Select All
"File" Menu Commands
{command} + N New Finder Window
{shift} + {command} + N New Folder
{command} + O Open
{command} + S Save
{shift} + {command} + S Save As...
{command} + P Print
{command} + W Close Window
{command} + I Get Info
{command} + D Duplicate
{command} + L Make Alias
{command} + R Show Original
{command} + T Add to Favorites
{command} + {delete} Move to Trash
{command} + E Eject
{command} + F Find
"Go" Menu Commands
{command} + {shift} + C Computer (local)
{command} + {shift} + H Home Directory
{command} + {shift} + I iDisk
{command} + {shift} + K Network
{command} + {shift} + A Applications Folder
{command} + {shift} + U Utilities
{command} + {shift} + G Go To Folder...
{command} + K Connect to server
{command} + [ Go Back
{command} + ] Go forward