Robert Jordan has written a short story that was published in a recently released book called Legends. The title of the story is "New Spring". In "New Spring," Robert Jordan tells of crucial events in the years leading up to The Wheel of Time, of the meeting of Lan and Moiraine and the beginning of the search for the child who must grow to lead in the Last Battle.
This story fills in a few of the blanks that RJ has left in the story of Moiraine and Lan, and is a must read.