When we implemented claim based authorization in LitwareHR, we had to write a lot of code and play with non-trivial configurations (LitwarehR includes 2 STS and all the supporting infrastructure for securing the web services and the callers to them)....

I just uploaded the source code for this library, used in the Virtual Earth mash-up described in my previous post . You can browse/download it from here . What you will find: A simple domain model for GeoRSS feeds with support for points , lines and polygons...