US aid agencies are on an open data roll this month. On Monday, we applauded Treasury’s release of technical assistance program data in Excel and International Aid Transparency Initiative (IATI) formats. Yesterday, the US Agency for International Development (USAID) released more than 53,000 FY2013 financial transaction records on the US Foreign Assistance Dashboard, and the Millennium Challenge Corporation (MCC) posted much of its open data catalog information in the IATI format on its website, too. All three agencies will likely see steady or higher marks in the 2013 Aid Transparency Index that comes out in October (but finished collecting data yesterday). Regardless, we're giving a huge “hooray” for the major boost in amount and detail of publicly-available US aid data and hope it spurs interesting analysis and ideas to better communicate and inform development policymaking and practice.