That's a long list, so I didn't scroll all the way through. But if these are not on there-
The Zombie Survival Guide (different from the #8 or so spot book)
Pride, Predjudice and Zombies.
The Resident Evil books aren't too bad if you're a fan of the games. (Not great literature, though)
I don't know if the Halo books after the 1st one can count as zombie books. But the Horde sounds like zombies.
There is a free series of online books called the Zombie Chronicle by James Melzer. Just goodle that and it pops up his website. It's a bit different, but kinda fun.
I apologize if these are listed in that big list; I didn't have the patience to go through the whole thing, but I liked the above that I listed.