Before you develop your app, it’s important to become familiar with the technical, content, and design criteria that we use to review all apps. We’ve highlighted some of the most common issues that cause apps to get rejected to help you better prepare your apps before submitting them for review.
Most interesting to me is that 6% of the rejections are apparently because Apple doesn’t like the user interface.
Update (2014-09-04): David Smith discusses the changes to the App Review Guidelines.
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