Many American cities are now fiscally and economically stronger than they have been in years. However, the task of revitalizing America's cities remains unfinished, as does the challenge of pursuing sustainable development across metro areas and balancing the need for new growth with smart reinvestments in already developed urban areas. Returning urban brownfields to productive community use is a central aspect of both aims. Towards this end, the Department is a principal partner in the Administration's initiative to help communities clean up and sustainably redevelop brownfields -- a priority for State and local elected officials. Our tools include a new Brownfields Economic Development Initiative (BEDI) to specifically address brownfields redevelopment needs, participating in the Administration's Showcase Communities Initiative, providing technical assistance to State and local governments, and streamlining community development regulations to make them "friendly" to brownfields redevelopment. Expanding our knowledge base and developing new tools is a vital part of our commitment. Consequently, the Office of Policy Development and Research has initiated an active brownfields research and development program. The purpose of our brownfields R&D work is to better understand how brownfields become barriers to revitalization of America's distressed communities and to develop ways to overcome or eliminate those barriers.