"My Forums" - Shows a link to every topic you've participated on.
"Karma" - Feedback system to replace the rating system, where users can give you + or - karma points based on your forum activity/helpfulness.
"Thank this Post" - Allows users to show their appreciation on a post level; users who "thank" a post will have their PDN listed at a bottom section of a post that looks like: Users who have thanked this post: Gizmo (Aug 11, 2008), SirDude (Aug 2, 2008), Ian (July 25, 2008)