I know Gustopoet is finishing one up soon. It's aimed at dispelling a lot of the myths that have circulated after the shooting.
I was planning on writing a narrative, novelized timeline of the events leading up to the shooting, but I still have to finish this other crappy book I'm stuck on. Friggin' last ten pages too...
Also, I would have to create certain interactions and events for the sake of making it a compelling read. I'm loathe to do that, since it would probably end up in the historical fiction category by then.