We have been exploring the potential of a web-supported professional development system, the Inquiry Learning Forum (ILF), that integrates videotaped classrooms and discussion forums for use in preservice science methods classrooms. This article examines pre- and inservice teachers' perceptions about using the ILF and how their participation in the ILF helped to enhance their teaching. Using specific naturalistic research methods, we discovered that preservice teachers placed high values on watching teacher practice through videos. Preservice teachers interacted with inservice teachers through asynchronous forums where they discussed videos of teacher practice. These methods served as a valuable tool to help them understand different learning theories and reform-based teaching practice used in a classroom. This article concludes with a discussion of the challenges encountered, lessons learned, and recommendations for other teacher educators who decide to incorporate a web-based professional development system into their courses. (Contains 3 figures, 2 tables, and 1 note.)