Here's a link to David Wellington's website. He's written a zombie trilogy, Monster Island, Monster Nation and Monster Planet. It got a little to magic-y for my taste, but you might like. The best part is, all three books are available on the website as completely FREE downloads (or you can buy the printed ones from Amazon).
This guy actually got his start by self-publishing Monster Island as an online serial, with new chapters every couple of days. It got him noticed and got him a publisher.
I actually prefer his vampire series: 13 Bullets, 99 Coffins and Vampire Zero.
Thirteen Bullets is also available online for free on that site.
I absolutely love his take on vampires. It's a unique twist on the genre.
Edit: Oops, forgot the link:
http://www.brokentype.com/monster/