As advocates across the country celebrate Sunshine Week, a time to focus on government transparency, the Department of Health and Human Services is proud of its work in spearheading greater data transparency. Signature among our work in this area is the Health Data Initiative (HDI). Founded in early 2010, the HDI is a three-pronged effort to publish brand new HHS data for public access; use tools to that make existing HHS data much more accessible; and energetically market and promote our data to innovators who can creatively use it as raw material to develop applications and services to improve health. Based on the principles of improved access to data from all sectors of health and healthcare, collaboration by a wide array of organizations, and participation by many individuals, HDI is a powerful emerging catalyst for change. Remarkable insights are being gained into some of our most vexing challenges in health care, and new windows of opportunity are opening for an incredible array of data-fueled innovations that embody American ingenuity.