OER Commons provides open educational resources for teaching and learning that are freely available on-line for everyone to use, whether you are an instructor, student, or self-learner. OER Commons uses Web 2.0 features such as tags, ratings, comments, reviews, and social networking in order to create an on-line experience that engages educators in sharing their best teaching and learning practices. OER Commons is a project of ISKME, and it encourages users to use any Creative Commons license except No Derivatives.