Tomorrow marks the opening of Women Deliver 2010, the largest conference on women and maternal health, held June 7-9 in Washington, DC. Speakers will include UN Secretary General Ban Ki Moon, Christiane Amanpour, Helene Gayle, and Melinda Gates, among others. The 2007 conference brought together more than 2000 participants from 115 countries, and brought emphasis to the importance of maternal health in achieving the Millennium Development Goals. Live webcasts are available; the Lancet has also released a themed issue in honor of the event.