Adobe Photoshop CS4 Keys for using the Adjustments panel keyboard shortcuts keys

Shortcut                                                                          Command
Optn + 3 (red), 4 (green), 5 (blue)	Choose a channel for adjustment
Cmnd + 3 (red), 4 (green), 5 (blue)	Select individual channels in the Channels panel
Optn + Cmnd + 3 (red), 4 (green), 5 (blue)	Load individual channel as selection
Optn + 2	Choose composite channel for adjustment
Cmnd + 2	Select composite channel in Channel panel
\ (backslash)	Toggle layer or smart filter masks
Cmnd + 1	100% view
Cmnd + `	Switch to next document
Shft + Cmnd + `	Switch to previous document
Delete	Delete layer