Eric is a detailed writer, and his postings are mainly essays, so don't get any ideas about compiling your daily livejournal entries about your cat into a book. This does prove that it is possible to author a book through your blog, and then use existing content to publish your blog in book form.
This entry will appear in Chapter 6 of my book, Wavesmash - Deep Thoughts in a Shallow Pond, titled How to Write a book based on your WebLog.
Get your comments in to the book now...