This is great announcement.  Take a look at the whole press release here: http://www.microsoft.com/presspass/features/2006/feb06/02-09ISAServer.mspx   This is an announcement from Ted Keummert.  Ted Kummert, corporate vice president for Security, Access and Solutions, discusses the acquisition and new milestones for Microsoft’s security products, including ISA Server, Antigen for Exchange and Client Protection.
I liked this question and answer from the press release:
PressPass: How will customers benefit from deploying the new version of ISA Server?
K
ummert: Through its tool set for publishing Microsoft Exchange and SharePoint Servers, ISA Server 2006 enables businesses to provide employees and partners with more secure remote access to business applications from PCs or mobile devices. The combined firewall, VPN and Web-caching capabilities of ISA Server 2006 enable businesses to more securely connect remote branch offices to their corporate headquarters, while providing fast Internet access from branch offices. ISA Server 2006 provides a single solution with common management infrastructure and a common set of tools and user interfaces as well as a wide array of partner appliance solutions to further simplify deployment across organizations.