On April 2nd, the National Archives release the 1940 census data. Until the end of 2012, you are able to browse the census images for your relatives. If you know where they lived in 1940, search the archives to view the scanned images of the actual census. Unfortunately for now, you can't search for specific names, but if you know where your relatives lived at the time you should be able to find them. I was able to find both Mr. MK's and my great grandparents as well as some great great grandparents. I am fascinated by the history of people so it's fun to see their names on the lists.
Were you able to find anyone you know? I would be interested to here who you found. Leave me a comment!