The White House website will show nominations and appointments as they are made public. For nominations currently before the Senate please see the Senate website.
Links to all U.S. federal government departments and agencies may be found at Official Federal Government Web Sites, a Library of Congress Internet Resource Page or the United States Government Manual which is available from the U.S. Government Publishing Office (GPO).
Links to Cabinet Department websites are below. Please consult their biography or ‘About’ pages for details of current incumbents:
Secretary of Commerce
Secretary of Defense
Health and Human Services (HHS)
Homeland Security (DHS)
Housing and Urban Development