Linda, I apologize for this appearing at the top instead of nested -- I couldn't figure out how to change it!

My first reponse was to say "let them play", but having just hosted a workshop where everyone came out asking for "how to" advice, I'm thinking differently. Perhaps one could describe it first as an interactive calendar, into which you can plug activities that students can use.

Then you can talk about what those activities can do for students: let them access learning materials, discuss with each other in real time or by messages or by discussion boards, etc. Use the weekly format first, since it's most like a calendar. Then show that it can also be used in its social (discussion only) or topical formats for more flexibility. But I'd start with calendars as a concept.

If their interest is primarily their own organization (grades, materials, schedules, testing), the calendar focus works there also.

Just a thought! :-)