Steve Jobs recently announced Apple’s intention to support third party applications on the iPhone. It is great news that Apple is going to offer an SDK for the iPhone, but clearly the iPhone will not be an open source device. Jobs mentioned that the primary challenge of “opening” the iPhone is insuring that the device is secure against viruses and other malware. Of course, what this means is the Apple will maintain strict control of how third party applications can access the underlying OS and hardware. Time will tell how this will benefit iPhone users.