Switching to the Mac: The Missing Manual, Lion Edition

File Menu

-N	New Finder window
Shift--N	New folder
Option--N	New smart folder
-O or -↓	Open
Control--O	Open in new window
Option-click File menu	Changes “Open With” to “Always Open With”
-W	Close window
Option--W	Close All
-I	Get Info
Option--I	Show Inspector
Control--I	Summary Info (of selected icons)
-D	Duplicate
-L	Make Alias ...