Calling all iPhones: FarmVille is here!

This image is not an optical illusion. FarmVille for iPhone has officially arrived in the US App Store. Millions of virtual farmers rejoice, knowing that they can now tend to their crops anytime, anywhere. You can download the game from the App Store here.

FarmVille for iPhone was first announced earlier this month at Apple's Worldwide Developer's Conference, and Zynga CEO Mark Pincus quickly gave a demo of the game, but didn't spill any additional details, such as an exact release date and the differences between the iPhone and Facebook versions. It makes sense, however, that the portable farm-fest rolls out now, just as iPhone 4 arrives and FarmVille celebrates its one-year anniversary.

The game was first spotted in the New Zealand iTunes store and downloaded immediately. First impressions of the portable FarmVille ran hot and cold. While the game seems to integrate easily with the Facebook version (enter your email and you're basically up and running) the game was moving very slowly. Like, molasses slow. When I tried the FarmVille later, it moved at a slightly faster clip, and I assume that's because it's running on the iPhone 3GS, rather than the slower iPhone 3G.