Adobe FrameMaker is the industry-leading tool for creating long or complex technical documents. Paired with Quadralay's WebWorks Publisher, it is also an excellent tool for single source solutions that involve some combination of print or PDF, online Help, and Web-based information.
FrameMaker 7: The Complete Reference by Sarah O'Keefe and Sheilas Loring, McGraw-Hill, /Osborne, ISBN 0-07-222361-8.
The Masters Series: FrameMaker 6 by Thomas Neuburger, Twelfth Night Books; ISBN: 1-930597-01-0.
Framers Mailing List - Framers is an unmoderated forum for sharing experiences and information about FrameMaker. To subscribe, visit the site, click the "Framers Forum" link, and fill out the form.
Adobe User to User Forums - Adobe maintains user to user discussion groups for many of its products, including FrameMaker and Frame+SGML.