Adobe After Effects CS3 General keyboard shortcuts keys

Shortcut                                                                        Command
Cmnd+A	Select all
F2 or Cmnd+Shft+A	Deselect all
Return	Rename selected layer, composition, folder,effect, group, or mask
Enter on numeric keypad	Open selected layer, composition, or footageitem
Cmnd+Optn+Down Arrow or Cmnd+Optn+UpArro	Move selected layers, masks, or effectsdown (back) or up (forward) in stacking order
Cmnd+Optn+Shft+Down Arrow or Cmnd+Optn+	Move selected layers, masks, or effectsto bottom (back) or top (front) of stacking order
Shft+Down Arrow	Extend selection to next item in Projectpanel or Effect Controls panel
Shft+Up Arrow	Extend selection to previous item in Projectpanel or Effect Controls panel
Cmnd+D	Duplicate selected layers, masks, effects,text selectors, animators, puppet meshes, shapes, or compositions
Cmnd+Q	Quit
Cmnd+Z	Undo
Cmnd+Shft+Z	Redo
Cmnd+Optn+/ (on numeric keypad)	Purge all