A site for design tips, tool tricks, book reviews, and more for designing and writing WinHelp.
http://www.winhelp.net
Information of key features and functionality of WinHelp and their recommended Help authoring tools.
http://winhelp.com
Armada, UK based team of technical authors producing up-to-the-minute, Microsoft standard, context sensitive, compiled (chm) HTML help . . .
http://www.microsoft-html-help.co.uk
The largest repository of help-related freeware and shareware tools and utilities anywhere on the internet. If you're looking for something, look here first.
http://www.helpmaster.de
Resources, downloads, links, and tutorials on the use of Help Authoring software.
http://www.magrino.com
Resources for the majority of Help formats.
http://www.helpauthoring.com/