Switching to the Mac: The Missing Manual, Lion Edition

In the Finder

-space	Highlights Spotlight box
Option--space	Opens Spotlight window
→, ←	Expands or collapses a selected folder in list view
Option-→	Expands a folder in a list view and all folders inside it
Option-←	Collapses a folder and all folders inside it
-↑	Opens parent folder
Shift-Option--↑	Selects the desktop
-↓ (or -O)	Opens the selected icon
Option-click the flippy triangle	Expands or collapses all folders within that window
Tab	Selects next icon alphabetically
Shift-Tab	Selects previous icon alphabetically
space bar	Opens Quick Look preview of highlighted icon(s)
space bar	During a spring-loaded folder drag, opens the disk or folder under the mouse immediately
Option-click Zoom button	Enlarges the window to full screen
Option-click Close button	Closes all Finder windows
Option-click Minimize button	Minimizes all windows (works in most apps)
-drag an icon	Moves it into, or out of, the System folder (administrator ...