This year I have switched from Blackboard to TWEN as a tool to augment my classroom teaching. I mainly use these services to post PowerPoint slides, announcements, links to relevant materials and resource materials. In other words, I use them as a resource rather than relying on them as a teaching tool. I know some schools have contracts with one or the other service, and some offer professors and students the option of using either. So I'm trying TWEN this semester. Lots of people have said to me that they prefer TWEN to Blackboard, but I can't immediately see why. It is very easy to use, but the newer versions of Blackboard are pretty easy to use too for the purposes of posting information, announcements, resources. Are there other functionalities that are handled better in one or the other platform? What are your experiences?