Menu Shortcuts
Operation PC Mac Key
Actual Pixels CTRL+OPTCMD+ALTzero(0)
Auto Levels CTRL+shiftCMD+ShiftL
Bring Layer Forward CTRL+ShiftCMD+Shift]
Bring Layer to Front CTRLCMD]
Clear Delete
Close CTRLCMDW
CMYK Preview CTRLCMDY
Color Balance CTRLCMDB
Color Balance, with last settings CTRL+OPTCMD+ALTB
Copy CTRLCMDC
Copy Merged CTRL+ShiftCMD+ShiftC
Curves CTRLCMDM
Curves, with last settings CTRL+OPTCMD+ALTM
Cut CTRLCMDX
Desaturate CTRL+ShiftCMD+ShiftU
Defloat CTRLCMDE
Fade Filter CTRL+ShiftCMD+ShiftF
Feather Selection CTRL+ShiftCMD+ShiftD
Fill Shift+DeleteShift+DeleteShift+Delete
Filter (repeat last with same settings) CTRLCMDF
Filter (repeat last with new settings) CTRL+OPTCMD+ALTF
Fit on Screen CTRLCMDzero (0)
Float Selection CTRL+OPTCMD+ALTarrow
Free Transform CTRLCMDT
Gamut Warning CTRL+ShiftCMD+ShiftY
Grid, show or hide CTRLCMDquote (")
Group with Previous Layer CTRLCMDG
Guides, show or hide CTRLCMDsemicolon (;)
Hide Edges CTRLCMDH
Hide Path CTRL+ShiftCMD+ShiftH
Hue/Saturation CTRLCMDU
Hue/Saturation, with last settings CTRL+OPTCMD+ALTU
Inverse Selection CTRL+ShiftCMD+ShiftI
Invert CTRLCMDI
Layer Via Copy CTRLCMDJ
Layer Via Cut CTRL+ShiftCMD+ShiftJ
Levels CTRLCMDL
Levels, with last settings CTRL+OPTCMD+ALTL
Lock Guides CTRL+OPTCMD+ALTsemicolon (;)
Merge Down CTRL+ShiftCMD+ShiftE
Merge Visible CTRLCMDE
New CTRLCMDN
New, with default settings CTRL+OPTCMD+ALTN
Numeric Transform CTRL+ShiftCMD+ShiftT
Open CTRLCMDO
Page Setup +ShiftCTRL+ShiftP
Paste CTRLCMDV
Paste Into CTRL+ShiftCMD+ShiftV
Preferences CTRLCMDK
Preferences, last panel CTRL+OPTCMD+ALTK
Print CTRLCMDP
Quit CTRLCMDQ
Redo CTRLCMDZ
Rulers, show or hide CTRLCMDR
Save CTRLCMDS
Save As CTRL+ShiftCMD+ShiftS
Save a Copy CTRL+OPTCMD+ALTS
Select All CTRLCMDA
Select None CTRLCMDD
Send Layer Backward CTRL+ShiftCMD+Shift[
Send Layer to Back CTRLCMD[
Snap to Grid CTRL+shiftCMD+Shiftquote (")
Snap to Guides CTRL+ShiftCMD+Shiftsemicolon (;)
Undo CTRLCMDZ
Ungroup Layers CTRL+ShiftCMD+ShiftG
Zoom In CTRLCMDplus (+)
Zoom In, all the way CTRL+OPTCMD+ALTplus (+)
Zoom Out CTRLCMDminus (­)
Zoom Out, all the way CTRL+OPTCMD+ALTminus (­)

Sorry Mac users the rest is for PC users..

Convert PC to Mac
CTRL = CMDOPT = ALT

  Navigation
Operation Shortcut
Scroll image with hand tool Spacebar-drag or drag in Navigator palette
Scroll up or down one screen Press Page Up or Page Down
Scroll up or down slightly Shift-Page Up or Shift-Page Down
Scroll up or down exactly one frame in FilmStrip file Shift-Page Up or Shift-Page Down
Switch to upper left corner Press Home key
Switch to lower right corner Press End key
Zoom in without changing window size Click zoom in icon in Navigator palette
Magnify to custom zoom ratio without changing window size CTRL + drag in Navigator palette
Zoom in and change window size to fit CTRL + plus (+) or CTRL+ spacebar+click
Magnify to custom zoom ratio and change window size to fit CTRL+spacebar+drag
Zoom out without changing window size Click zoom out icon in Navigator palette
Zoom out and change window size to fit CTRL+minus (­) or OPT+spacebar+click
Zoom to 100% CTRL+OPT+zero (0) or double-click on zoom tool icon
Fit image on screen CTRL+zero (0) or double-click on hand tool icon
Apply zoom value but keep magnification box active Shift+Return