Tagboards

Tagboards are like little messages attached to your content where your learers can leave notes. They differ from comments, which are attached to individual pages or posts, in that you just have one tagboard for your whole course, and learners can read the messages right on your homepage. It can be a good way to encourage interaction among your learners and create a sense of community on your blog.

In reality, it is probably worth looking at other community tools in most cases because largely Tag Boards are lower-end solutions - but good for quick and easy.

Tag-Board

Chatterbox