NDAs (non-disclosure agreements) are very common in the high tech world. Companies routinely make journalists, developers, and employees sign them before disclosing any potentially sensitive information. The iPhone SDK has been under an NDA since its launch, and many developers had hoped that Apple would expire that NDA during WWDC, so that information could flow. A source tells us that the iPhone SDK NDA (try saying that five times fast) will not expire until the iPhone 2.0 firmware ships on July 11th. While this makes sense, it also certainly makes some people's lives just a little bit harder.