It's like a free ride when you've already paid

In a few weeks I am giving a presentation on blogging to our local Mac users group, which is somewhatironic, given that my blogging lately has been about as regular as a senior citizens' home during a prune juice shortage.

Still, it will happen. I am planning on going over a very general history of blogging, followed by showing of some of the specific Mac-based tools for creating and posting to blogs.

One of the features of blogs that I plan to highlight to differentiate them from traditional home pages is the interactivity, and in that vein, I am going to ask you for advice...if you were giving a presentation on blogging to folks who may have heard the term but don't know much more about it, what would you cover, and what would you be sure not to leave out?