Several Journals (such as PNAS) now provide the option for authors to make their papers "open access". Usually by paying an extra fee (around $1,500 for PNAS). Some authors do this since it can increase their visibility.
In other cases, it is a condition of funding that that the paper eventually be freely available (sometimes with an embargo of about a year).
In all, I think the open access model will become more widely accepted, with the exception, maybe, of papers published in the top journals, such as Nature or Science.
In other cases, it is a condition of funding that that the paper eventually be freely available (sometimes with an embargo of about a year).
In all, I think the open access model will become more widely accepted, with the exception, maybe, of papers published in the top journals, such as Nature or Science.