WIKI

How about a WIKI? I have seen several educational wiki's and think that, of all courses, calculus would be a good candidate for one. Calculus is full of new concepts students have difficulty with. Different approaches to these concepts is sometimes all that is required to get the lightbulb to turn on.

Perhaps edits by both teachers and students would be useful. Students with posts on what did turn on the light.

Dangerous, of course, to let students post as they have a tendency of clowning. Perhaps the calculus student is a more mature young person though.