Today, Amazon blessed Android users with a gem of a freebie: Plants vs. Zombies! Weighing in at 75MB, Plants vs. Zombies has players waging war on the undead...with sunflowers, peashooters, walnuts and cherry bombs (amongst other plant life). If you have yet to play this unique tower defense game, do yourself the favor and scoop it up while you can. After all, free is free right?