The United States National Archives maintains the Archives Library Information Center (ALIC). The ALIC is described on its webpage as follows:
The Archives Library Information Center (ALIC) is more than a traditional library. Recognizing that our customers no longer expect to work within the walls of a library, these pages are designed to provide NARA staff and researchers nationwide with convenient access to content beyond the physical holdings of our two traditional libraries. ALIC provides access to information on American history and government, archival administration, information management, and government documents to NARA staff, archives and records management professionals, and the general public.As part of these services, the ALIC has a useful reference page dedicated to genealogy. This webpage provides many valuable links for both the beginning and advanced genealogical researcher. For example, one of the linked pages includes genealogical information on other federal agency websites.
I am certain that many of the resources linked from this page are going to be new and unexplored by nearly all genealogists. The reason for this conclusion is that I see almost no references to these resources in any of the genealogically oriented conferences or other educational materials.