Microsoft might not be planning to do any further development on TMG, but that doesn’t mean third party vendors are going to stop improving their TMG add-ons. Fastvue has just released a new version of its TMG Reporter with some great features such as custom reports, SQL support and a redesigned Alert Settings page. See the custom reports feature in action on their blog:
http://www.fastvue.co/blog/new-forefront-tmg-reporter-features-update-2-0-2-641