I haven't read it yet, but I like the topic and the approach: The Corporate Blogging Book... and blog!
Debbie Weil uses her blog to promote her book.
This became a commonly used strategy for books on topics linked to the Internet such as blogging or networking. The writers use buzz marketing and word and mouth: blogging is a very efficient way to "spread the word"!
Books & Blogs: social & business networking
Another very famous example is the Virtual Handshake from David Teten and Scott Allen. In France, Alain Lefebvre promotes its book Les Reseaux Sociaux on his blog (in French).
Technorati: blogging, weblogs, socialnetworking, businessnetworking, buzz