Scot Hillier is an independent consultant and Microsoft SharePoint Most Valuable Professional focused on creating solutions for Information Workers with SharePoint, Office, and related .NET technologies. A frequent speaker at TechEd and SharePoint Connections, he is also the author many books on Microsoft technologies including 5 for SharePoint 2010. Scot splits his time between consulting on SharePoint projects and training for Critical Path Training. Scot is a former U. S. Navy submarine officer and graduate of the Virginia Military Institute. Scot can be reached at scot@shillier.com
I worked on this article along with Ted Pattison showing how to create a Custom Claims Provider based on SharePoint audience membership. Finally, some much-needed documentation is in place on MSDN.
http://msdn.microsoft.com/en-us/library/gg615945.aspx