A story in the scholarly kitchen quotes a leaked draft of a new federal government data policy saying:

...every department and agency is directed to inventory all of its funded datasets and put them all into Data.gov to the extent practicable. This is basically a fundamental change from voluntary to mandatory inclusion and from "a few of your best" to "everything you have."

Read the complete article here:

• Leaked Data Policy Raises Monster STM Data Issues, by David Wojick, the scholarly kitchen (Jan 17, 2013)

  ...there is almost no STM research data in Data.gov, just a few bits and pieces...

  All this may now change because the draft data policy takes a new approach to feeding Data.gov. Now, every department and agency is directed to inventory all of its funded datasets and put them all into Data.gov to the extent practicable. This is basically a fundamental change from voluntary to mandatory inclusion and from "a few of your best" to "everything you have."