<a href="http://developer.apple.com/iphone/terms/registered_iphone_developer_20081020.pdf" rel="nofollow">http://developer.apple.com/iphone/terms/registered_iphone_de...</a><p>I don't see anything in the iPhone developer agreement that addresses this point.<p>If all you're sharing is your code, and not any of their headers, documentation, etc., then you're free to do so.<p>There's a good deal of high-quality open-source iPhone library code out there on github right now.