HTMLHelp
Developing HTML Help, Help Consultants, HelpMaster, HTML Help - Context Help Ids, HTML Help - Using Merge, HTML Help Center, Microsoft HTML Help Site, Microsoft standard compiled HTML Help from Armada, New HTML Help Standard
NetHelp
Adding NetHelp2 to Your Application, Getting Started with NetHelp, How NetHelp Works, NetHelp, NetHelp FAQ
Help Authoring Resource Center
Resources for the majority of Help formats.