Is there a way (probably an app) that lets you see all global (and possibly local) keyboard shortcuts that have been defined? Something similar to ActiveHotkeys on Windows. I dislike assigning new keyboard shortcuts without being sure that they won't cause shortcut collision.
There is a rather expensive program that does just this. I installed it on several classroom Macs, to help new users learn keyboard shortcuts.
"Key Cue" http://www.ergonis.com/products/keycue/
Works well, easy to use, but at $28.00 a little pricy.
I'm not a Windows user so I'm unsure of what ActiveHotKeys does. However, on System Preferences on the Mac OS X, there's a Keyboard preferences which when clicked will display "Keyboard Shortcuts" (the choice to the right of "Keyboard").
Hope this helps, and please mark your question as answered if this is what you're looking for.