The National Archives will release the 1940 Census on April 2, 2012, making it available for online searching - free of charge.
Are you prepared to dive in?
What you need to know in order to begin research in the 1940 census:
Finding our links in History - One Genealogist's thoughts, tidbits, and inspirations - All very much randomly posed. One person's life does not stand-alone but interacts with family, neighbors, community, and history. Our Trees become Tangled just by living. -- T.