It is important that teachers be exposed to different technologies so they cannot only find ones that will or will not work for them, but also know what is available. The problem is finding time to investigate/explore and then implementing them into the classroom.

This might be something that teachers might find overwhelming. You have 4 section of American History. Each with 30 students and now they are all sending you questions, posting to forums and other activities that you need to check. How much time is this going to take? When will your teaching day end? When you post to a forum, it does not post until after 30 minutes.