PopCap Games, Inc. has Plants vs. Zombies (iTunes Link) for the iPhone and iPod Touch and Plants vs. Zombies HD (iTunes Link) for the iPad in the iTunes App Store for FREE ($4.99/9.99 value) for limited time.

A mob of fun-loving zombies is about to invade your home. Use your arsenal of 49 zombie-zapping plants — peashooters, wall-nuts, cherry bombs and more — to mulchify 26 types of zombies before they break down your door.