"An author inserting himself into his work is also a very difficult balance to get right. More often than not, they can end up looking full of themselves. Not satisfied to provide a Deus Ex Machina from their pen, they have to insert an image of themselves into the story as well. Your mileage may vary, but personally I enjoy the rather self depreciating version of Stephen King who appears in The Dark Tower series. I also feel like his appearance just makes sense, given the nature of the story and the various worlds our characters can go between, why not also show up in the "real world" as well?"
For more, check out Angie's latest post.