Getting started on Blogging 101

I'm getting ready to start teaching a 45 minute class on blogging to freshmen who may wish to start a blog for a technology credit, or just for personal reasons. But what to say?

(Note: the plan is to host this repeatedly at different times of the day over the next few weeks, so that everybody has a chance to come. I think I'll invite teachers, too.)

I am thinking of the following:

• What, exactly, is a blog?
• How is it different from writing a paper?
• episodic
• invites responses 
• Why would I want to blog?
• get feedback
• make contacts
• self-promotion 
• How do I start blogging?
• Blogger (or Wordpress, I know, but we'll use blogger)
• Quick walkthrough
• How do I get anybody to read this stuff?
• Read and comment on other blogs
• Technorati
• Intro to RSS
• Google Reader
• Delicious?
• Twitter
• Intro to twitter
• tags
• Tell me - I'll blog about it, and post it.
• Google Profiles

What am I missing? And what should I cut to get this into a 45 minute class?