Tom Barrett already has a list going." So I went to the Interesting Ways page on Tom's blog and sure enough there I found 37 Interesting Ideas for Class Blog Posts. I added one of my ideas to the Google Presentation and I encourage you to add your ideas.
Applications for Education
If you're looking for new things for your students to blog about or new ways to use your classroom blog, 37 Interesting Ideas for Class Blog Posts is a good bet for a place to find a new idea.