Dan Cohen tries to make the case for “open source” academic publishing on his blog. In part:
The dirty little secret about open access publishing is that despite the fact that although you may give up a line in your CV (although not necessarily), your work can be discovered much more easily by other scholars (and the general public), can be fully indexed by search engines, and can be easily linked to from other websites and social media (rather than producing the dreaded “Sorry, this is behind a paywall”).
(Postscript 4/13/2013: Cohen has been named founding Executive Director of the Digital Public Library of America. Link to his talk about the DPLA.)