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A new document format by Wolfram Research, designed to address the weaknesses of traditional documents based on paper or modelled after paper documents.
From the web page: "Today's online documents are like yesterday's paper—flat, lifeless, inactive. Instead, the Computable Document Format (CDF) puts easy-to-author interactivity at its core, empowering readers to drive content and generate results live."
Link added on 2011-07-21