Castle's TV/Book Cross-Over

As I wrote about in July, the lovely people at ABC have released a book based on the tv show Castle. If you haven't seen the show, it's about an author (fantastic Nathan Fillion) who works with a cop while collecting information for his new book. Which is the book they've just published. Yes it's a bit confusing, but a neat idea nonetheless.
There's more information about what's going on here, you buy the book here, and download free sample chapters here. I'm not sure I'll buy it, but will probably try to acquire it somehow (from the library or bookmooch) once it's in paperback and read it. I really like the tv show - Fillion is fantastically witty and the ensemble cast works well together.
It's not Firefly, but it'll do for now.