Adobe InDesign CS5 API Navigator is available on Adobe labs web site. You can download for free.
http://labs.adobe.com/technologies/indesign_apinavigator/
If you are an InDesign C++ plug-in developer, you should definitely try this new tool.
The InDesign API Navigator is a tool for InDesign C++ Plug-in developers. It works as an add-in for Visual Studio on Windows and as a plug-in for Xcode on Mac OS X. It helps developers get API information within the IDE directly, including Boss definitions, aggregating Bosses for interfaces, and ODFRC type definitions. It also adds syntax coloring for ODFRC files (.fr and .fh). It extends the debugger expression evaluator to understand some InDesign types, which allows the debugger to format some InDesign types nicely in the variables pane (Xcode) or watch window (Visual Studio) while debugging. In Visual Studio, it enables the IDE to browse InDesign C++ APIs.
Try it and give your comments.
Thanks