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):

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

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

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

I hope those help you with your DFS Namespaces projects.