Have you played Zombie Dice? If you haven't, you should. It's relatively inexpensive, and a ton of fun to play. And games don't take long either, which is frequently a bonus for those of us who don't have more than a few minutes here or there on a given day to devote to gaming.
I just discovered today that Zombie Dice is also available for the iPhone, iPad, and iPod Touch. Best of all, it's free! Really, the most entertaining part of it is that your zombie opponent talks throughout the game and he's pretty hilarious. The iPhone version of the game seems to favor the opponent as well, because in the 5 games I've played today I have yet to win once.
But it's not all about winning. It's about fun! And this game has a lot of that to offer.