Gary Bart, former CEO and founder of iPod and iPhone accessory developer XtremeMac, has resigned as his position as Executive Director of XtremeMac’s acquiring company Imation. “I am working on a new project and I will continue to be directly involved in the iPod/iPhone market,” Bart told iLounge in an email, adding, “When I have specifics to share, you will be among the first to know.” XtremeMac began the year by…