THE GRAVEYARD BOOK is, of course, very popular. I found it intriguing and well-written.
And though this one is not new, I still distinctly remember reading GHOSTS BENEATH OUR FEET when I was in 6th grade. That book scared the daylights out of me (of course, it didn't help that I was reading late at night under my covers)!
Also, I haven't read it yet, but I recently picked up a copy of THE BOOKS OF ELSEWHERE: THE SHADOWS. It has a creative premise and might be worth checking out.
Best of luck!
Laura