This article identifies several benefits of student online collaboration and describes a number of collaborative tools that can be used without charge. The author also shares with readers several different strategies for promoting collaboration, including some of his personal tips and suggestions, based on his experience of teaching an online course on Critical Thinking at UMass Boston. The author argues that online education offers many opportunities for students to learn a variety of subjects, think critically and work collaboratively. However, for online faculty to be effective in their teaching they need training and experience.