The DirectAccess Early Adopter's Guide, updated for Windows Server 2008 R2 Release Candidate (RC), is published in the following locations:
This guide has the latest conceptual, planning, design, deployment, and troubleshooting information for DirectAccess in Windows Server 2008 R2 RC and Windows 7 RC.
If you are investigating DirectAccess, use the Step By Step Guide: Demonstrate DirectAccess in a Test Lab white paper to configure DirectAccess and see it working in a simplified test lab.
Principal Technical Writer
Windows Server Networking Documentation Team