GPG for the Masses

FireGPG tweaks Firefox so that you can highlight text and then right click to choose to de/en-crypt that text. I'm curious about the same thing but integrated with an operating system's file browser so that you could right click on the icon for a file and then choose to produce a .gpg version of that file or produce a decrypted version without the .gpg. I think this would help the average user get more comfortable GPG.