Microsoft Office SharePoint Portal Server 2007 Administration is an excellent book at just over 1100 pages. I just finished reading it today and I’m very impressed with the content. I would give it an 8 out of 10 simply becuase some of the step by step material has gaps. For the most part, it covers most if not all the subjects surrounding administration.
I expect HPs Disgital Press will be publishing their Office 12 book in a few months and their books are typically more focused on architecture. If you purchase thier book in addition to Bills, you will have some great reference material.
Bills book covers:
  • Planning
  • Administration and Configuration
  • Search, Indexing and Shared Services Provider
  • Integrating Additional Server Platforms
  • Upgrading from 2003
  • Extending SharePoint 2007