open access to federally funded research

ARL's (Association of Research Libraries) page Framing the Issue - Open Access provides detailed information about open access to scholarly publication and research.

The following definition of open access to scholarly and scientific information is provided:

"As used by ARL, open access refers to works that are created with no expectation of direct monetary return and made available at no cost to the reader on the public Internet for purposes of education and research. The Budapest Open Access Initiative stated that open access would permit users to read, download, copy, distribute, print, search, or link to the full texts of works, crawl them for indexing, pass them as data to software, or use them for any other lawful purpose, without financial, legal, or technical barriers other than those inseparable from gaining access to the Internet itself."

The argument is that any government funded research (and its corresponding publications) should be free to be accessed by anyone. This is rather a specific proposition related to government funded research. How about open access to all scholarly publications? What factors need to be in place to make this happen? For pros and cons argument please see open access to scientific information.