Suite à ma session des Microsoft TechDays, voici quelques ressources utiles sur la protection de Sharepoint avec ISA et Forefront/Antigen

Forefront Security for SharePoint

Microsoft Forefront Security for SharePoint: Features

Publishing Windows SharePoint Services with Microsoft Internet Security and Acceleration (ISA) Server 2004

SharePoint Portal Server 2003 Document: Deploying on an Extranet by Using ISA Server 2000 and ISA Server 2004

Reverse Proxy Configurations for Windows SharePoint Services and Internet Security and Acceleration Server

Sharepoint 2007

Configure alternate access mapping (AAM)

Supported Project Server 2007 extranet topologies

Sharepoint 2003:

Scenario 3: Single Portal Site on a Single Virtual Server (Using ISA Server 2004)

Step 6: Verify that the Proxy Server Settings for SharePoint Portal Server Search Are Correctly Specified

Step 12: Edit the web.config File