Mary
In reading your posting and thinking about it I wonder if we should
have
> some kind of a tree structure that starts in each category (Art Gallery,
> Voronoi Diagrams, etc.) with an general explanation of the topic for the
> benefit of the teacher (rather than each lesson explain Voronoi Diagrams
> in general, do it once as an overview) and then two branches, one for
> paper and another for the web with specific applications of the topic.
> Links would connect an application that has both modes.
>
> Bill