This book provides information and guidelines for making decisions about system architecture for a deployment of Microsoft SharePoint Server 2010. Subjects include system requirements, authentication, and business continuity management. Capacity planning information is provided in a separate book (link follows).
The audiences for this book are business application specialists, line-of-business specialists, information architects, IT generalists, program managers, and infrastructure specialists who are planning a solution based on SharePoint Server 2010. This book is part of a set of four planning guides that provide comprehensive IT planning information for SharePoint Server.
And if you are looking for a good SharePoint Server 2010 Technical Reference, grab it @ http://www.microsoft.com/downloads/en/details.aspx?FamilyID=a3b9fa1b-0300-489e-8d67-f14deb4c3a56.