While waiting until April 2012 when the 1940 Census is released, there are some alternative resources available to help piece together what some family members were up to.
For example, we know from the 1930 Census that Fred Long was in California with his "second" wife Vera. I found them in a 1942 Voters' Registration Log.
They were living at 2521 Howland Dr, Santa Anita Precinct #4, in Los Angeles County. They were both registered as Democrats and he was listed as a Saleman. Don't forget you can click on it to make it bigger. This gives a lot of the same information that the Census would provide. I'll have to go back and see where I can find him first in California.