In a nod to the persistence of paper, meet Blurb, a web-based technology (not the first) for creating your own book, starting at $12.95. Neatest feature is Slurping your blog into a book. Needs some editing, but an interesting concept–better if each post includes a photo.
What would I do with a book of my blog? Well, if I were a student, I could turn it in as an assignment (if I had $12.95), or give it to my parents as proof of work! If I wanted to eliminate a blog and start over, I could keep the book as a reminder of past work. What else?