Path / Direct Selection tools A
Print One Copy Ctrl+Alt+Shift+P
Fill with background color Ctrl+Backspace
Brush / Pencil / Color Replacement tools B
Revert F12
Fill with foreground color Alt+Backspace
N Crop / Slice / Slice Selection tools C
Save Ctrl+S
Free Transform Ctrl+T
Default Foreground and Background Colors D
Save As Ctrl+Shift+S
Free Transform with duplicate Ctrl+Alt+T
Eraser / Background Eraser / Magic Eraser E
Save As Copy Ctrl+Alt+S
Keyboard Shortcuts Alt+Shift+Ctrl+K
Gradient / Paint Bucket tools G
Save for Web & Devices Ctrl+Alt+Shift+S
Menus Ctrl+Alt+Shift+M
N Hand tool (bird's eye view) H
Paste Ctrl+V
N Eyedropper / Sampler / Ruler / Note / Count I
Select Alt+S
Paste Into (selection) Ctrl+Shift+V
Spot Healing / Healing / Patch / Red Eye J
All Select Ctrl+A
Paste Outside (selection) Ctrl+Alt+Shift+V
NE 3D Rotate / Roll / Pan / Slide / Scale tools K
All Layers Ctrl+Alt+A
Preferences (General) Ctrl+K
Lasso / Polygonal Lasso / Magnetic Lasso L
C Contract Ctrl+Alt+ [
Preferences (last used) Ctrl+Alt+K
Rectangular / Elliptical Marquee tools M
Deselect Ctrl+D
C Purge All Ctrl+Shift+ '
NE 3D Orbit tools (Roll View / Pan View / etc.) N
Edit in Quick Mask Mode (on / off) Q
C Purge All (no dialog) Ctrl+Alt+Shift+ '
Dodge / Burn / Sponge tools O
C Expand Ctrl+Alt+ ]
Step Backward (history) Ctrl+Alt+Z
Pen / Freeform Pen tools P
C Feather Ctrl+Alt+D
Step Forward (history) Ctrl+Shift+Z
Inverse Ctrl+Shift+ I
Transform Again Ctrl+Shift+T
N Rotate View tool R
Transform Again with duplicate Ctrl+Alt+Shift+T
Clone / Pattern Stamp tools S
Undo / Redo Ctrl+Z
Type tools (Horiz / Vert / Horiz Mask/Vert Mask) T
Shape tools (Rect / Round Rect / Ellipse / etc.) U