Parece que ActiveHotkeys pode ser o que você quer:
On several occasions there have been requests for a program that displays what global keyboard shortcuts are registered by various applications. ActiveHotkeys does just that: it will show a list of all active (registered) or inactive (available) global hotkeys.
Updated to version 1.1 - the Play/Pause edition. Totally free for all; please let me know if you encounter a problem. No installation necessary - just unpack and run. See the included readme file for details (or click the About tab in the program).
Download links are at the bottom of this post. Please be sure to download the latest version.
Please note that Windows does not allow for detecting which application has registered a particular shortcut, so that feaure is not included. (If you think you know how to achieve that, using message hooks or what-not, please post here or earn some karma at StackOverflow)