Apple has begun to take action against iPhone app ripoffs that have been crudding up the App Store. Over the weekend, the company removed a number of apps that bear a striking similarity to ones that are already popular among iOS users—the list includes Angry Ninja Birds, Plant vs. Zombie, and Temple Jump, which correlate to the popular titles Angry Birds, Plants vs. Zombies, and Temple Run (hat tip to Gamasutra). The move is encouraging to developers who have been struggling with knockoffs attempting to steal their business on the App Store, but there's plenty left to do if Apple wants to show it's serious about tackling the problem once and for all.

Apps attempting to clone—or at least ride the popularity wave of—other apps has been a problem for iOS developers for years now. Ars first started covering the phenomenon in early 2009, but examples continue to pop up on both the mobile App Store as well as the Mac App Store.

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