Most of the Longhorn Beta 3 guides are now in a nice tidy place on the download center.  Here's the list:
  • Creating and Deploying Active Directory Rights Management Services Templates Step-by-Step Guide.doc
  • Step-by-Step Guide for Configuring a Two-Node File Server Failover Cluster in Windows Server Longhorn.doc
  • Step-by-Step Guide for Configuring a Two-Node Print Server Failover Cluster in Windows Server Longhorn.doc
  • Using Identity Federation with Active Directory Rights Management Services Step-by-Step Guide.doc
  • What's New in Failover Clusters.doc
  • What's New in Terminal Services for Microsoft Windows Server Code Name Longhorn.doc
  • Windows Server Active Directory Rights Management Services Step-by-Step Guide.doc
  • Windows Server Code Name Longhorn Beta 3 Active Directory Certificate Services Step-By-Step Guide.doc
  • Windows Server Longhorn Beta 3 Release TS Gateway Server Step-By-Step Setup Guide.doc
  • Windows Server Longhorn Beta 3 Release TS Licensing Step-By-Step Setup Guide.doc
  • Windows Server Longhorn Beta 3 Terminal Services RemoteApp Step-By-Step Guide.doc
  • Windows Server Longhorn Beta 3 Windows Deployment Services Step-by-Step Guide.doc

Download @ http://www.microsoft.com/downloads/details.aspx?FamilyID=518d870c-fa3e-4f6a-97f5-acaf31de6dce&DisplayLang=en