July 4, 2012 
Best practices for setting up SharePoint 2010 Extranet Environment
- http://technet.microsoft.com/en-us/library/hh204611.aspx
, provides advice regarding SharePoint Extranet environments. Created by members of Microsoft Consulting Services. - http://www.microsoft.com/en-us/download/details.aspx?id=24079 , extranet topologies.
- http://blogs.kma-llc.net/microknowledge/2011/06/sharepoint-2010-extranet-topologies-and-firewalls.html , extranet topologies and firewalls.
- http://technet.microsoft.com/en-us/library/cc263513.aspx , more extranet topologies.
