Consider documenting which units are included in which runtime package
I've always wondered why this isn't already documented considering how long packages have been around. I started to document this over on delphi.wikia.com but it would probably be more useful if each package had its own page listing links to the units it contains and each unit's page included a link to the package it is included in.
The msdn documentation for the .NET framework is kind of close to what I'm describing. For each type, method or property it describes which namespace and which assembly that construct is a member of.
Contains the core functionality of the runtime type library upon which all other packages depend.
Anyway, just a suggestion.