Crystal Lake Publishing has released a Kindle book they are calling an “interactive shared-world zombie anthology.” It is called Children of the Grave. They say, “Basically you follow a character through Purgatory, and after the initial story, you decide which route (each written by a different author) he will take. You can either follow your chosen path or your favorite author through the after-life.”
I’m guessing the level of interactivity is very low, but I find it interesting that they thought of, and are promoting, the concept. It seems that some book publishers are at least exploring the possibilities of interactive fiction.
(I’ve got a review lined up for my blog in a few days, though he’s talking in Oxford tomorrow evening and I want to go along and see that in case there’s anything I learn that I’ll want to add to my blog post.)