Need Advice

I want to start my students into the world of blogging next year and I need a bit of advice...

Each week my students have a "weekly reader" assignment (thank you Jim Burke!), whereby they go to a website and respond to what the see/hear. My idea for this coming year is that instead of turning their weekly reader assignment in via the traditional method, they post it as a blog entry. That way fellow classmates (or whomever comes across the entry) can comment. I will require all students in the class to sign-up to each blog via a RSS reader.

Here's my main question...

Should I have them sign-up for their own blogs via a source like Blogger or Wordpress? Should I add pages to our current site: Lahaise's Lair, should I add pages to my "personal' blog: Paige's Prose, or something different?

I would really love input from those of you who have experience with student blogs.

Thank you!!