Also on VisualStudio Gallery is now the final beta of the CatNet in VisualStudio with TeamMentor VS2010 Extension (this is based on the same FluentSharp API as the VisualStudio C# REPL
Please give it a test drive in VisualStudio 2010 and start thinking about the best way to use this technology/technique to communicate with developers.
This is the version that has the integration with Cat.NET SAST engine, and if all goes OK, it should look like this after a compilation:
... and like this (after selecting one of the errors):