Dave Thomas on how the NDA surrounding the iPhone SDK is preventing Pragmatic Programmers from publishing books and screencasts on iPhone Development:
So, to write a book about the iPhone SDK, you have to download it. In order to download it, you have to accept the agreement. And the agreement says that the download will contain confidential information that you can’t pass on to third parties. That makes it hard to publish the book. And, if that wasn’t enough, it also appears that you can’t even use the word “iPhone” (for example, in a book title).
The secrecy was frustrating but understandable while the SDK was in beta. Now it’s just frustrating.