Today at 9am DST NARA will release the 1940 US Census for use. Groups such as FamilySearch.org will be downloading the images for indexing. This should take most of the day for the over 3 million images involved. Volunteer indexers are needed to create the name index for easy searching of this census. You can volunteer at Familysearch.org to help index this census.
For us old timers finding our ancestors in USC1940 is just like using Microfilm and viewing a geographic location page by page. Those newer to Genealogy will find this method tedious and probably tiresome. Hence the need for Volunteers to index the census. Join the effort anf sign up at Familysearch.org to index. It is easy and you can do as little or much as you want.
Good luck finding our ancestors
Wayne E. Weatherwax