There is an achievement in the Xbox 360 of Minecraft for curing a Zombie Villager from its infection.
Is there a way to save the poor villager from its infection?
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Make a Splash Potion of Weakness (use a Fermented Spider Eye and Gunpowder) and throw it at the villager. After they have that effect, feed them a regular Golden Apple (via the Use Button). In a while, they will turn back into a regular villager.
Note, though, that it's a good idea to keep the villager somewhere sheltered so he doesn't burn before he transforms.