Are there any shortcuts to label a file in Finder?
The fastest way i know is to place an icon in the menubar, but it would be much better when i can do it with the keyboard.
You could make your owns, creating an Application with Automator and then assigning a Shortcut to it.
To create the Aplication just:
Now, you could assign a shortcut to it with an application such as QuickSilver, for instance.
I had assigned shortcuts to scripts like this in FastScripts, but I stopped using them because getting the selection does not work reliably in 10.7 or 10.8.