I’m not sure if the GMail Notifier installs the updater — I have a GMail address, but I forward all the email to a different (non-gmail) account, so I don’t even use the GMail interface (I hate the idea of having all my email in one, free email account!).
LittleSnitch is awesome! It has snitched on so many programs. It makes you realize how much chatter goes on behind the scenes!