Microsoft has released Service Pack 2 (SP2) for TMG 2010 Standard and Enterprise editions.
The service pack includes the following new functionality and feature improvements:
• The new Site Activity report displays a report showing the data transfer between users and specific websites for any user.
• A new look and feel has been created for error pages.
• Error pages can be more easily customized and can include embedded objects.
• You can now use Kerberos authentication when you deploy an array using network load balancing (NLB).
To read the release notes, see the Forefront TMG Release Notes (SP2).
Download SP2 here