This author has developed a free utility, called Introspector, that lets you browse the introspection object model of assemblies on your system. You might find this tool useful when learning the introspection API and when developing custom rules. It eliminates some of the trial-and-error part of the development process by enabling you see beforehand the contents of the collections and properties made available by the introspection API.

If you are familiar with Lutz Roeder's .NET Reflector tool (http://www.aisto.com/roeder/dotnet), Introspector provides far less analysis and navigation features (and no decompiler). Instead, it aims at presenting the introspection objects with minimal transformation so that you can readily use what you discover in the tool to write custom rules against the introspection API.

The user interface consists of:

Introspector is available for download at http://www.binarycoder.net/fxcop.