SharePoint 2010 Kerberos Guide
A really comprehensive guide on SharePoint 2010 identity scenarios. It is a must read for everyone planning a SharePoint 2010 deployment.
Grab it from here: https://download.microsoft.com/download/B/B/F/BBF0C6F3-6E36-4979-8C43-DE165AD7AE34/SP2010 Kerberos Guide.docx