Online Books:

• DITA Language Specification
• DITA Architectural Specification
• DITA: An XML-based Technical Documentadon Authoring and Publishing Architecture. : An article from: Technical Communication, by Michael Priestley, Gretchen Hargis, Susan Carpenter. Avaialble from Amazon.
  

Online Articles:

• Adobe Systems Speaks Out on DITA: Internal use of FrameMaker, CMS, and DITA - by Kay Ethier and Scott Abel
• DITA for DocBook - Implementing the Darwin Information Typing Architecture for DocBook.
• DITA and the Beatles - Gilbane Report Blog : Posted by Bill Trippe at October 4, 2005 
• I Column Like I CM: Lovely DITA, Meta Maid, Ready-made Metadata - EContentMag : By Bob Doyle
• More DITA: Another Interesting Case Study - Gilbane Report Blog : Posted by Bill Trippe at September 23, 2005
• DITA - Getting Started - Christian Kravogel, SeicoDyne GmbH, and Boris Horner, Dr.-Ing. Boris Horner
• An XML Architecture for Technical Documentation: The Darwin Information Typing Architecture - by Don Day, Erik Hennum, John Hunt, Michael Priestley, David Schell, Nancy Harrison 
• DITA - The mechanics of a single sourcing project - France Baril, Documentation Architect; Ixiasoft  
• The Darwin Information Typing Architecture: Avoiding Proprietary Lock-in - by Kay Ethier, Bright Path Solutions and Scott Abel, The Content Wrangler 

Online Reviews:

• FrameMaker 7.2 and DITA - Gilbane Report Blog : Posted by Bill Trippe at September 14, 2005