The Weblog Handbook: Practical Advice on Creating and Maintaining Your Blog
This is NOT a technical book. You won't find a lot of technical detail on templates or PHP code in here. She does give an overview of the some basic content management software, although no mention of pMachine! What you'll find in this book are topics like 'audience', 'community building' and 'ethics'. I'm very enthusiastic about 'blogging' and this book has served me well - I've learnt a lot and I'm encouraged to do more.
Rebecca Blood has been running her famous blog - [url=http://www.rebeccablood.net]Rebecca's Pocket[/url] since 1999. This is a very good example of what a 'blog' should be. Her book is excellent and you can be sure that she has enough experience to be taken seriously.