Apple has just released the 8th edition of the iPhone SDK. This version is the beta release 8, and includes XCode 3.1. This version includes everything that is needed to author, test and publish software applications for the iPhone OS. The new iPhone SDK is fully compatible with iPhone OS 2.0 and will be necessary to use in order to sign applications to submit them to the App Store. Apple also notes that in order to publish applications in the App Store, users must be a member of their iPhone Developer Program. The 8th beta release also includes everything that was in all the previous versions, such as the full XCode IDE, the iPhone simulator with OpenGL support, and much more. In addition to iPhone applications the XCode IDE also allows users to create applications for Mac OS X. The iPhone SDK can be downloaded directly from Apple’s website, but you must be registered first.