Structured learning activites using web 2.0 tools

What we have seen is that each piece of the web 2.0 puzzle can act discretely, as an individual entity which can add value to a particular learning exercise. But the real power of these tools is exposed when we coalesce them into structured learning activities. One clear path is to scaffold the student experience by introducing topics with lots of multimedia support and gradually build up student skills and confidence until they are ready to tackle new problems by themselves. For instance, we can provide a lecture which presents derivations of equations and some sample applications of a concept. Then we can provide a simulation/animation which shows the concept in action. Then we can illustrate the application of that concept on a simple problem via a video solution, then on a more complicated problem. Finally, a student will be ready to enter into independent problem solving, starting with simpler problems and gradually progressing to more complex problems.

That's alot of work for the instructor...how do we develop exercises like this based upon SGC? I think the mashup comes sort of close to this, but only if we can get students to create their own materials which they add to existing materials. What do you think? How would you structure learning activities (and evaluate them) in your discipline based upon web 2.0 tools and strategies?