Ok here some nice shortcuts for u guys.. this has taken me awhile so please be nice :p

Modes


Q- Quick mask mode toggle = view selection as rubylith overlay, accepts paint tools
F- Cycles through Normal and 2 full-screen modes — very useful for previewing without clutter
Tab- Removes all palettes
Ctrl ; - Show/Hide Guides
Ctrl ' - Show/Hide Grid
Ctrl R - Show/Hide Rulers

Layer


Ctrl Shift N- New Layer
Ctrl E- Merge Down
Ctrl J- New Layer from selection by Copy
Ctrl Shift J- New Layer from selection by Cut
Ctrl G- Clipping Group with previous layer

Tools


V- moVe
M- Marquee (Shift M, circular Marquee)
C Crop
W- Wand
B- Brush
E- Eraser
S- cloning Stamp
N- liNe
T- Type
K- fill bucKet
I- Idropper (eyedropper)
G- Gradient fill
P- Pen
O- Dodge / Burn / Saturate (Shift cycles through)
R- bluR / shaRpen / smeaR (Shift cycles through)
H- Hand
Z- Zoom

Color

D- Default colours (Foreground/Background to B/W)
X- Xchange (Swap) foreground/background colours)

Image tweaks

Ctrl M- Gamma Curves
Ctrl L- Levels
Ctrl U- hUe / saturation / lightness
Ctrl B- colour Balance


Random

Alt Backspace- Fill with foreground colour
Alt Shift Backspace- Fill with foreground colour, preserving transparency
Shift F5- Fill dialog box
[ ]- [Square brackets] Brush size up/down
ctrl z-undo
ctrl alt z-undo further
Control K - Removes the grey/blue box in the top left of your canvas.
Cntrol Q - Closes the open document.

Hope you guys enjoy this and find it useful

CREDITS : HCG

nice shortcut keys..
gud job