There's an awesome app (AppCleaner) that deletes anything related to any app. It doesn't leave no folders nor files related to the app you're trying to delete, as with the normal deleting way of dragging out an app to the trash bin.
You can get it here, http://www.freemacsoft.net/appcleaner/
I use it everytime and it works for me. It will still ask you for your administrator password nonetheless, which is cool.
Personally, I like growl, it has worked beautifully in sync with ML notif center through Hiss. I'm happy with it and don't mind it at all. But I've got rid from some other apps with no secondary effects.
Hope it works for you if not found it yet (didn't read all of the posts). Greetings