Dear god, don't buy it now! It's about to be re-released and the previous publication is out of print. goto
www.raptorman.us and check out the status. You can also read a portion of the book online. And it's a good sized chunk to, not just a 3 page snapshot.
Honestly, I havn't found a better one yet, though there are some good ones out there other then Day by Day Armagedon. "The Cell" by Stephen King is a good one, though it isn't technically zombies in the traditional sence, it's still a good read. Also, "World War Z" is ok but it's not technically a single story, but is written as a collection of reports AFTER a world wide zombie infestation.
If you are after zombie-like stuff there is "The Zombie Survival Guide" which isn't technically a zombie story, more like a field guide to surviving a zombie infestation, attack strategies, ext.
There are a number of books about zombies that I am looking at that are published by permuted press. Check them out at
Permuted Press. I can't say what there quality is, but so far they all look promising. It's also the company that's going to be re-releasing Day by Day Armagedon and will likley be publishing Day by Day Armagedon 2, and another story J.L. Bourne has in the works that at one time was titled "Dead Land" but has been changed to something else that is based in the same world as Day by Day Armagedon.
Anywho, I like zombies too.