The classic wave defense game, Plants vs. Zombies, has had a big update to their iPhone and iPad apps. There's now an endless vasebreaker mode, which spans 9 levels of defending against zombies hiding in fine china. You only get one to start, but can unlock the others with coins you earn through gameplay or in-app purchases. There a a bunch of new achievements for Game Center, plus a smattering of minigames, such as a slot machine, "Portal Combat", "Zombiquarium", and "Beghouled Twist". Finally, there's a Zen Garden included if you just want to have a place to quietly tend to your various plants and pick up some coins along the way.
If you haven't had a chance to play PvZ, you should check it out; it's a goofy, but very tactical and fast-paced game. Basically, you get a wide variety of plants to protect your home from various fronts of zombie attack. The zombies come in waves, and have different gear to get around your defenses, like pole vaults to get over the first plant it bumps into, or screen doors to provide some extra protection. PopCap had a bunch of the zombies running around PAX East 2012 dancing and giving away iPads, which reminded me just how much I loved the franchise. Check out the video below.