Just bought me a bunch of blogging books to use for reference in my research paper on… guess what?

• We Blog: Publishing Online with Weblogs
• The Weblog Handbook: Practical Advice on Creating and Maintaining Your Blog
• We’ve Got Blog: How Weblogs are Changing Our Culture
• Blogging: Genius Strategies for Instant Web Content
• Essential Blogging
• Small Pieces Loosely Joined: A Unified Theory of the Web

These seem to be the most highly recommended books on the topic. Have I missed anything, or have I just made any bad purchases?