Here is a link to Short Cut World; it goes to the PC CS5 shortcuts but on the top you will see the tab for the Mac and on left hand column you will see all kinds of other programs listed.

Short Cut World

Photoshop CS5 – Custom Keyboard Shortcut Reference Guide

Buried away in Photoshop CS5 is the ability to generate your own Custom Keyboard Shortcut Reference Guide.

Since users commonly create their own shortcuts for Photoshop, this is a very important feature. But, even if you only use the Default Keyboard Shortcuts, this Guide will be a great reference.

Go to Edit > Keyboard Shortcuts

From this panel,you can add your own Custom Keyboard Shortcuts. But, it’s the Summarize button that does the magic. Just click the button and specify the location. Photoshop will then generate your Custom Keyboard Shortcut Guide in HTML.

Also, I just uploaded the HTG CheatSheet for Photoshop PDF in the Photoshop Workshop Files folder.