The best way to compete with the iPhone is certainly to offer Mac users the ultimate compatibility between Mac OS X and a third party mobile phone. Palm did it by forcing iTunes to recognize the Palm Pré as an iPod. As a consequence, both companies have some difficulties to exchange or communicate at the moment.
Rim decided to act differently with its BlackBerry, and developed a dedicated application known as Blackberry Desktop Manager.
It offers a deep integration and compatibility with Mac OS X, supporting synchronization with iCal, Contacts, Notes, etc and iTunes music library. This application should be available in a near future and could offer an excellent opportunity to Blackberry owners to switch to Mac