The Harvard Business Review publishes many articles (7,557) on Design Thinking. It is after all gradually being recognized as a successful way to help companies to become more innovative and to make innovation more effective by focusing on users needs.

Here are some good articles?

• The Explainer: Design Thinking - video
  • Clear 2 minute introductory video to explain design thinking
• Design Thinking - Tim Brown (IDEO) (Subscription only)
• Design Thinking Comes of Age - Jon Kolko
  • Good explanation of the principals that are applied in a design centric culture.
  • Examples referenced are GE and IBM
  • Discusses the challenges of integrating design thinking into a company's culture: 
    • Accepting more ambiguity
    • Embracing risk
    • Resetting expectations
• Design for Action - Tim Brown (IDEO) and Roger Martin (Rotman School of Management)
  • They argue that with the design of (ever more) complex artifacts, that "their introduction and integration into the status quo—is even more critical to success than the design of the artifacts themselves"
  • Examples referenced are MassMutual, Intercorp/Innova School (Peru)
  • Introducing disruptive/breakthrough ideas requires two designs, the design of the artifact/service/experience as well as the design of the intervention that brings it to life
  • This article discusses how a big business can encourage, support and develop a local economy through developing new businesses and schools for local communities that get them on the path to a middle class lifestyle.
  • They show how the Intercorp story shows that design thinking principles has the potential to be even more powerful when applied to managing the intangible challenges involved in getting people to engage with and adopt innovative new ideas and experiences.
• How PepsiCO's Indra Nooji (CEO) turned Design into Strategy - Adi Ignatius
• Why Design Thinking Works - Jeanne Liedtka