White papers are a valuable source of information, and Mary Ellen Bates has written a variety of white papers:

• The Art of E-Newsletters: ideas to effectively create and market electronic newsletters" June 2007.
  [Free to download. Requires Adobe Reader. ]
  
  
• Creating Groupies, or, Showing the Information-Hungry People Within Your Organization That They Desperately Need You" June 2006.
  [Free to download. Requires Adobe Reader. ]
  
  
• Marketing for the Info-Entrepreneur: Top Techniques to Build Your Business FreePint, May 2004.
  
  
• Getting Your First Five Clients, a white paper published by the Association of Independent Information Professionals. 2000.