21classes was mentioned in this afternoon's session on blogs and wikis. I featured a blog called Classroom 2.0 in the blogs portion of the presentation and I found a blog describing 21classes. Have a look. http://www.classroom20.com/forum/topics/21classes-1 No product is perfect. Another blog on Classroom 2.0 compares Class Blogmeister with 21 classes: http://www.classroom20.com/forum/topics/649749:Topic:58145 . Interesting discussion. Ultimately, you use what works for you.