Operarion: Eradicate looks interesting. Just lunched and is going to be half off until next Sunday, so its currently $1.99. Seems to be a clone of the boardgame
Pandemic, but instead of fighting of spreading disease you're fighting off zombie outbreaks.
I've got a week before the price goes up so I'm going to wait and see if the reviews are good before jumping in.
EDIT
Well, I happened to see they were going to give away copies to Twitter and Facebook followers. They only had 20-ish Twitter followers and 100 on FB, so I figured it was worth a shot. I won a copy on Twitter, so I'll be able to give it a spin and report back.
EDIT2
Ok, downloaded it and ran through the tutorial. Its very heavily based on Pandemic (at least from my reading and understanding of the rules of Pandemic, since I have yet to play it). So, thats cool. But I can only recommend the game if you have an iPad. It will run on my iPod, but the text and buttons are super tiny and it makes it difficult to play or even know whats going on. Had to hold the thing 2 inches from my face to read anything.
iPad = Yay
iPhone/Pod = Pass
Hopefully they update to maybe fix this, because I really would like to play it.