For folks who are shortcut-shy, and could use some encouragement, here's a shortlist you can practice with so you feel like you're really cooking at the keyboard.

I'll list all the ones I can think of in the off chance that at least a few of them will help you. Then in hopes of surprising you, I'll list in brackets (][) what happens if you add the Shift key to each command. Since I'm on a Mac you should know the Command key is the same as Control on Windows and Option is the same as Alt. If you happen to be one of those people who uses both operating systems, you're welcome to download the keyboard layout illustration, which shows the diffence between the two keyboards (Mac and Win).

Download
Keyboard Layout (316K)

Command-A = Select All
Command-B = Color Balance [Auto Color]
Command-C = Copy [Copy Merged]
Command-D = Deselect [Reselect]
Command-E = Merge Down [Merge Visible]
Command-F = Apply last filter [Fade]
Command-G = Group with Previous [Ungroup]
Command-H = Hide Marching Ants, etc. [Hide Path]
Command-I = Invert Image [Inverse Selection]
Command-J = Jump to a new layer (New Layer Via Copy) [New Layer Via Cut]
Command-K = Preferences [Color Settings]
Command-L = Levels [Auto Levels]
Command-M = Curves [Jump to ImageReady]
Command-N = New Document [New Layer]
Command-O = Open [Browse]
Command-P = Print [Page Setup]
Command-Q = Quit
Command-R = Show/Hide Rulers
Command-S = Save [Save As]
Command-T = Free Transform [Transform Again]
Command-U = Hue/Saturation [Desaturate]
Command-V = Paste [Paste Into]
Command-W = Close Window
Command-X = Clear [Liquify]
Command-Y = Proof Colors [Gamut Warning]
Command-Z = Undo [Step Forward]

* The brackets (][) indicate what happens if you add the Shift key to each command.

* In Photoshop CS2, you can customize the keyboard shortcuts to your own liking by going to Edit>Keyboard Shortcuts.