This study investigated factors that predict preservice teachers' intentions to use Web 2.0 technologies in their future classrooms. The researchers used a mixed-methods research design and collected qualitative interview data (n = 7) to triangulate quantitative survey data (n = 286). Results indicate that positive attitudes and perceptions of perceived usefulness are significant predictors of preservice teachers' intentions to use Web 2.0 technologies. Additional findings indicate that preservice teachers intend to use blogs, wikis, and social networking in their future classrooms to improve student learning, student-student and student-teacher interaction, collaborative learning, student writing ability, and sharing content knowledge. Although preservice teachers intend to use Web 2.0 technologies due to these pedagogical benefits, they believe that successful use of Web 2.0 depends on the meaningful integration of these technologies with the subject being taught, learning goals, and age level of their students. This study has implications for teacher educators who are preparing preservice teachers to use Web 2.0 technologies in their classrooms. (Contains 2 tables and 3 figures.)