The HHS Office of the Assistant Secretary for Planning and Evaluation has published a notice seeking comments on the development of a national inventory of comparative effectiveness research (CER) and CER-related information. Comments should focus on appropriate resources and approaches for developing the CER Inventory, including sources of CER, ways to encourage participation, categorizing content, and approaches to ensure the CER Inventory is useful and sustainable over time. Comments are due August 9, 2010.