I get a number of questions regarding reference information for DFS Namespaces (also known as DFS-N). I gathered here the main links that can get you started on the subject:

Here are my own blog posts on DFS Namespaces (all updated for Windows Server 2008 R2 and including domain V2 namespaces):

• The Basics of the Windows Server 2008 Distributed File System (DFS)
• Three ways to design your DFS Namespaces
• How many DFS-N namespace servers do you need?
• Windows Server DFS-Namespaces Performance and Scalability
• Using the Windows Server 2008 DFSUTIL.EXE command line to manage DFS-Namespaces
• Five ways to check your DFS-Namespaces (DFS-N) configuration with the DFSDIAG.EXE tool
• Experimenting with PowerShell v2
• Understanding Windows Server 2008 DFS-N by analyzing network traces  

Next, here are a couple of public DFS Namespaces Presentations by Microsoft:

• DFS-N Overview and Scalability during SDC 2009 by Marcello Hasegawa, Saad Ansari and Jose Barreto
• DFS Namespaces Overview during SDC 2008 by Dan Lovinger 

Also, here are the main TechNet Reference links on DFS Namespaces for Windows Server 2008 and Windows Server 2008 R2 (includes domain V2 namespaces):

• Namespaces
• Overview of DFS Namespaces
• What's New in Distributed File System in Windows Server 2008 R2
• DFS Namespaces Frequently Asked Questions
• Deploying DFS Namespaces
• Review DFS Namespaces Client Requirements
• Review DFS Namespaces Server Requirements
• Choose a Namespace Type
• Installing DFS
• Create a DFS Namespace
• Migrate a Domain-based Namespace to Windows Server 2008 Mode
• Add Namespace Servers to a Domain-based DFS Namespace
• Create a Folder in a DFS Namespace
• Add Folder Targets
• Replicate Folder Targets Using DFS Replication
• Delegate Management Permissions for DFS Namespaces
• Tuning DFS Namespaces
• Enable Access-Based Enumeration on a Namespace
• Enable or Disable Referrals and Client Failback
• Change the Amount of Time That Clients Cache Referrals
• Set the Ordering Method for Targets in Referrals
• Set Target Priority to Override Referral Ordering
• Optimize Namespace Polling
• Using Inherited Permissions with Access-Based Enumeration

Last, here are some TechNet Reference on DFS Namespaces for Windows Server 2003 (does not include domain V2 namespaces): 

• Planning
• Deciding Whether to Implement DFS
• Reviewing DFS Terminology
• Reviewing the Benefits of Using DFS
• Evaluating Client and Server Compatibility
• Choosing the DFS Namespace Type
• Reviewing DFS Size Recommendations
• Planning the Number of DFS Namespaces
• Developing Root and Link Naming Standards
• Designing a DFS Namespace
• High Availability
• Increasing the Availability of DFS Namespaces
• Choosing an Availability Method for DFS Roots
• Choosing an Availability Method for Data in Link Targets
• Placing Multiple Targets
• Choosing a Replication Method
• Example: An Organization Designs a DFS Namespace
• Reference
• How DFS works
• DFS Namespaces FAQ

I hope those help you with your DFS Namespaces projects.