Zombie Shooting Gallery
Practice your headshots with this laser-targeting game. Just try not to shoot the live humans.
$34.99 from ThinkGeek

Zombie Fluxx Card Game
When the zombie apocalypse comes, you'll have to be fast on your feet. Keep your mental skills sharp with this game of ever-shifting rules.
$15.99 from ThinkGeek

Left 4 Dead 2
For the gaming zombie fan in your life, here's another game for working on your killing skills. Just steer clear of the Witch. Available for Xbox 360 ($50 from Amazon) and Windows ($29.99 from Amazon).

The Walking Dead Compendium
Robert Kirkman's series about humans trying to survive a world overrun by zombies is being turned into an AMC television series. While you're waiting, you can catch up with this omnibus, collecting the first eight volumes.
$37.79 from Amazon

Pride and Prejudice and Zombies by Seth Grahame-Smith
It's more of a novelty item than a great work of literature, but it's still great fun to see proper English ladies talk manners and zombie slaughter with the same breath.
$7.77 from Amazon