Introductory ordinary differential equations is the most challenging sophomore level mathematics course for most science, engineering, and mathematics majors. Over the past decade it has evolved into a hybrid course involving large lectures, group work in smaller discussion sections, team-based projects, and on-line material in pdf and video format. The materials developed have also been used by a local community college and by a local high school AP class. It incorporates both formative and summative evaluation. We will describe the course and survey its evolution.