Teenage Zombies: Invasion of the Alien Brain Thingys! Screens
Teenage Zombies: Invasion of the Alien Brain Thingys! looks like it could be a lot of fun, and IGN has some nice DS screenshots showing off the cartoonish horror look of the title.

If you haven't caught wind of this one yet, IGN fill you in:
"The Earth is under attack by a horde of Alien Brain … uh … Thingys! Humans, succumbing to ray-guns, mind-control, and shiny flying saucers, have failed to defend their planet and let it fall easily into the clutches of the Big Brain and his army of Brain Thingys. The only hope left for mankind is three Teenage Zombies that have arisen from a graveyard disturbed in the invasion. The undead trio ignores their normal human victims in favor of the pulsing pink brains they see EVERYWHERE – all the while being lured to the ultimate lunch: THE BIG BRAIN! The Big Brain soon refocuses his efforts and resources to battle the Earth's greatest champions: The Teenage Zombies!"
This reminds me a lot of an old Super Famicom title I forget the name of, and if it's anywhere near as good, it will definitely be making my DS wishlist when it comes out next year.
Ghoultastic.