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An addon that hogs all (well, almost!) the GUIDs it possibly can and creates a list of player names along with their gender, race and class.
The items (players) in the list can then be clicked to perform certain tasks:
/guidtracker [arg] <no arguments> - Toggle the displaying of the list frame reset - Place the frame in the middle of the screen if you happen to lose it. wipe - Delete all entries from the list.