Maaaaan.... I submitted that within hours of the announcement. And got nuttin! (http://news.ycombinator.com/item?id=2616450). It's a good program. More people should poke around that collection.
It's not a business, it's the publishing arm of the National Academy of Science, which was chartered to "investigate, examine, experiment, and report upon any subject of science" by the US Congress and signed into law by President Lincoln in 1863. The idea was the government needed an academy of experts to advise law makers on matters of science.
Published through the Government Printing Office (GPO), too, I believe. So it's basically, publicly funded research is now entirely publicly available.