The Exploring Florida Science project goals were: (1) increasing content knowledge of secondary science teachers, specifically in topics that are important to the future of the state, and (2) providing secondary science students with digital media for use in project-based learning. A team of instructional designers, educators, scientists, web designers and teacher educators designed an online professional development environment. Needs analysis included identification of the high incidence topics on the state science achievement test and topics of socio-scientific importance in the state. Development followed tenets of design-based research, and was guided by E-Learning for Educators standards and evaluated for content, pedagogy and usability using rubrics based on established guidelines. This paper details design, development, and evaluation frameworks, and summarizes pilot testing outcomes.