Most help related documents live on the various sites run by the MVPs

• MSHelpWiki > Support Groups
  A community MS Help KB run by the Help MVPs. The Support Groups page lists the various help discussion groups. 
  
  
• HATT · Help Authoring Tools & Techniques
  Yahoo Discussion Group. One of the most popular help discussion groups and a favorite haunt of many of the Help MVPs.
  
  
• Help MVP member sites -- Looking for training, contractors, tips, authoring tools? Check out these Help MVP sites.
• HelpAuthors.com 
• HelpStuff.com 
• Help-Info.de 
• HelpwareGroup.com