Nice non-technical overview of e-learning 2.0 that steps the reader through the essential concepts, getting quickly to the heart of the matter with knowledgable examples. Like this: "Hang on - I use Lectora and I already have 'drop in' interactions. What's different here? Well you do and its pretty much the same. But using add-ins instead of what the authoring tool provides allows me to choose best of breed." Yes. Exactly.