Plow, plant and harvest on the go 24/7! FarmVille, the most popular game on the web, is now available on your iPhone. Current FarmVille players can access their existing Facebook farm, and new users can create a farm.
A Facebook account is still required for gameplay, but they do offer access to existing farms. They promise some exclusive iPhone/iPod items as well. Farmville is a free download.
App Store Link: FarmVille, Free