I love my shortcuts. Especially since I have moved back to Mac where they are implemented much more consistently across the OS and all of the applications. Everyone knows about Command-C, Command-V, Command-X. Some might even know about cool things like:
Command-W: Close Window (or tab)
Command-Space: to start Spotlight. This is the BEST way on the planet to start up apps and finder folders. Just start spotlight and start typing the application name and hit enter. It rocks.
Check out this Apple Support page for TONS of Mac shortcuts.
Lightroom has zillions of keyboard shortcuts. OK, maybe like 200 or so. Anywho, there are a ton of them. Check out the LRKeys app for your iphone for some flash card like training tools to memorize your LR shortcuts. It is 99 cents so if you are feeling cheap check out the help docs or this PDF file(Mac) for printing and quick reference from the Lightroom Queen.
Check out both shortcut sets and start kicking some keyboard productivity ass!
