TMG 2010 Service Pack 2
• 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).
http://go.microsoft.com/fwlink/?LinkId=225004 – Release Notes