Great concept, really sharp graphic design on the book, good looking website, and the author's background in TV writing shows in the pacing and scene setups: it could probably make a good movie. But the writing is a big disappointment: cliched and clunky use of language. The book is attempting black humor, and in terms of setting up humorous situations and scenarios, it has some success: for instance, "Dead Ed". But the attempts at one-liners and comebacks just aren't funny, for my taste, but rather vulgar and lacking in imagination: it isn't black humor if it isn't first funny. And since I didn't find them funny, the insults based on eating disorders, wrist-slashing, underage pregnancy, menstruation, etc., were just unpleasant for me. However, if you find jr. high type insults funny, this book may work a lot better for you; and I suppose that to the intended audience, this may indeed be the case. The characterization and motivations for the characters are also rather flat and limited.
I'll grudgingly say 3 stars, since I did want to see how the story turned out, even though the writing style made me wince. But for much better books with an after life theme, see instead Repossessed, by A. M. Jenkins, which has more explicit sex talk but a much sweeter heart, or The Graveyard Book, by Neil Gaiman, which is just excellent.