This document summarizes a presentation about using Google Wave to expand pre-service teachers' critical thinking. It provides an overview of Wave's history and features. It then discusses an example of how Wave was used in a pre-service teacher training program to facilitate collaboration and feedback. Finally, it outlines some theoretical justifications for using collaborative technologies like Wave in language education based on social constructivism. Both the strengths of facilitating discussion and feedback and the weaknesses of technical issues are acknowledged.