Just to let you know TMG 2010 SP2 has been released
Here is the link to the update http://www.microsoft.com/download/en/details.aspx?id=27603&WT.mc_id=rss_alldownloads_all
The following functionality and feature improvements have been made (Referenced From the Above URL)
• 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).”