As shown in class today, using a wiki such as wetpaint in place of a power point, blackboard or overhead projector can be successful. The benefit of using and editing problems and activities on a wiki is that your students can access these problems at home. This could also be useful in having the students post content and ask questions.
This wiki is setup to provide educators and students with tips, suggestions, and templates for creating education wikis. - Wikis in Education. How teachers can use wikis in their classrooms.