"Trek 21: Educating Teachers as Agents of Technological Change," is a 3-year PT3 implementation grant from the United States Department of Education designed to build the capacity in teacher educators (teacher education faculty, professional development school faculty, pre-service interns) to integrate technology into their teaching. The goal of Trek 21 is to prepare educators to use and integrate instructional technologies teaching and learning. This paper discusses shifts in the development between year one and year two of teachers' Web-based instructional units, with a focus on the degree to which year two units feature greater student engagement using networked technologies. Through a detailed discussion of project events and participant outcomes, strategies of the Trek 21 Model of Professional Development process are illustrated. (Contains 27 references.) (Author/AEF)