Please let us add "Notes" to friends on our friend list.

The people we meet in FFXIV may have been for only moments, and we might friend them and forget who they were. This feature would allow us to tag them with notes, for one reason or another. Good examples of notes I might put on some friends would be, "Good SCH, knows Turn 5 fight.", "Has every craft 50", "Helped me get started", and so on.

Personally, I would have a note for every friend I have.
I think such a feature would be easy to implement and would be very useful.