Hi Emma- I tend to agree that we ought to summarize some of the core differences between various tools which -as you say- are changing as we speak. I think what would also be very useful would be some kind of simple assessment of what the differences might be (with real examples) between blogs and -say- wikis: I know in my own university teaching there is generally a huge ignorance about what blogs and wikis are and when and how you might use any of them and why.... so maybe there needs to be some contextualizing chapter that looks at the distinctive functionality of blogs in the wider context of internet tools.....
how does that sound?
Michael