A few links about converting Docbook data to DITA:
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Download for a customization for DocBook to allow DocBook books and articles to import DITA content by reference http://www-128.ibm.com/developerworks/xml/library/x-dita11/
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Implementing the Darwin Information Typing Architecture for DocBook http://norman.walsh.name/2005/10/21/dita
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How Did You Decide Between DocBook, DITA, or Custom DTDs: http://xml.coverpages.org/DocBook-DITA-customDTD.html
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What You Should Know About DITA http://www.arbortext.com/resources/dita_q_a.htm