Google desktop keeps coming up security wise. The truth is, it's not so insecure. It's insecure when you share profiles or don't have your home directory read only to yourself. The data files get stored in your home dir, so if it's accessible to anyone else, especially if you share your accounts, naturally, google desktop will use that one index.
Then B.I. said, "Hov' remind yourself nobody built like you, you designed yourself"