"iPhone SDK for iPhone OS 3.0 beta is for development use only. This new version should only be deployed on devices dedicated for iPhone OS 3.0 beta software development and cannot be used for submitting iPhone OS 2.2.1 applications." I want to start 3.0 development, but continue 2.2.1 dev. Does this mean I need 2 macs? Do I also need 2 iphones/ipods for testing (one with 2.2.1, one with 3.0)?