Just found out about a bunch of Webcasts that have been done on the Microsoft IAG 2007 that I thought you might be interested in. I'm in the process of trying to put together a lab for the IAG so that we can start pumping out some great information about the IAG and help support your IAG evaluation and deployment issues.
All of these Webcasts are great! Check them out:
TechNet Webcast: How to Define and Configure Endpoint Security Policies with the Intelligent Application Gateway (Level 300)
TechNet Webcast: Overview of Microsoft Edge Secure Access Technologies (Level 200)
TechNet Webcast: Securing Remote Access to SharePoint Products and Technologies, Exchange Server, and Microsoft Dynamics (Level 300)
TechNet Webcast: Providing Comprehensive Partner and Remote Worker Access with Secure Extranets (Level 200)