Petition granted to make taxpayer-funded research publicly available

According to the Huffington Post, the White House has just granted a petition to "require free access over the internet to scientific journal articles resulting from taxpayer-funded research."  Dr. John Holdren, Director of the White House Office of Science and Technology Policy, writes:

I have issued a memorandum today (.pdf) to Federal agencies that directs those with more than $100 million in research and development expenditures to develop plans to make the results of federally-funded research publically available free of charge within 12 months after original publication. As you pointed out, the public access policy adopted by the National Institutes of Health has been a great success. And while this new policy call does not insist that every agency copy the NIH approach exactly, it does ensure that similar policies will appear across government.

This sounds super-exciting, but I have some questions:

  • Which agencies conduct research for less than $100 million?
  • What constitutes an R&D department?
  • To what extent does this apply to research already done, and currently boxed-up?

I'll be looking over the next few days for criticisms of this response, and I'll report back on whether this is the step forward it looks like, or if it's a shiny but ultimately empty gesture.