Zoo Games is currently making a zombie FPS for Nintendo DS.
This is a first-person shooter in which players assume the role of a young couple attempting to fend off various evil creatures after their car breaks down. Players use pistols, shotguns, and machine guns to kill the cartoonlike enemies (e.g., zombies, skeletons, vampires, evil clowns) that attack with knives or balls of slime. Players must reload each weapon manually to continue shooting; enemies grunt or shriek when hit by the gunfire.
Check out the Zombie Seeker: FPS Zombie Shooter.