Marion Zimmer Bradley wrote an interesting novel about the Trojan War from the perspective of Cassandra. This was as brilliant an idea as her retelling of the Arthurian legend from the point of view of Morgaine.

It's an excellent literary device to have one character who knows what is going to happen but isn't believed - it's a sort of reversal of the suspense novel. Unfortunately, it turned out to be a strong concept with a weak execution.