I have chosen Vanilla Forum as a media tool. It is a light-weight tool to run forum on your website. It can also be embeded in existing school website seamlessly. I have been using for about 4 months now for my ICT class.
Complete evaluation of Vanilla Forum as a teaching tool is available here.
Here are some questions for discussion
What kind of learning activities can be done using forum?
Have you used forum website for teaching and if so then which forum did you use?
What could discourage teachers from using web-based technology for teaching?
Do you have any tips for educational use of forums?