Frequently, when we refer to Eliyahu (Elijah the prophet), the term זכור לטוב ("Remembered for good things") is used. I vaguely recall seeing the Talmud use this term for someone else, but I don't recall whom.
What is the reason fro using this term for Eliyahu or certain other people? What merits someone to have this term used? Is it reserved just for dead people, or can this be said about a meritorious living person?