Okay, I know of an interesting, unfinished book that has a hint of time travel, written by Tolkien. Its called the Lost Road, but he only ever wrote a chapter of two of it. Though it's typical Tolkien, and thus atypical time travel. Most of what he wrote for it is before the time travel takes place, and there are only a dozen or so pages after, but he had intended a longer story. Since it was never finished, almost noone knows about it (likewise no one knows of his sequel to Lord of the Rings, of which he wrote only 1 chapter). The Lost Road, basically, concerns a linguist in modern times (I think he was modelling this after himself), who continually has words in Elvish come to him. He stands on the edge of the sea and says things like "the Eagles of the Lords of the West coming upon Numenor" when he sees a distant stormcloud. Near the end of what was written, Elendil comes to him in a dream and says that it is ordained that he may travel back. This he does, and travels to the time just before the destruction of Numenor. The catch is that he takes Elendil's place and, after travelling back, appears to be Elendil (and thinks himself to be Elendil). This, however, gives remarkable insight into the Numenoreans of Tolkien's myth, as when Elendil tells his young son Isildur that their "darts fly over leagues unerring and pass like thunder" (guided missiles?!). It's a shame that the story ends shortly thereafter and that he never finished it.
