It’s often challenging to stop, because you just know there’s so much more that would be “useful.” But too many choices can slow things down. Customizable toolbars is a good metaphor, I think. You can easily add or drop the tools you need. In this case, you build the tools and let the user decide.

Wrote a fairly large help system a few years ago, which became a .chm and was favorably received. That taught me a lot about keeping things simple, and providing the user with the option to link to specific, more granular information if they needed it.

Mike