A resource with links to useful articles. (This may be too like the Links page to be useful - that should emerge in time.)
Peter Weiss's "Borders in Cyberspace" paper about the relative benefits of closed and open access to public data. Here's the HTML version; here, the PDF, here.
April 4: Locus responds to the Free Our Data campaign. Locus is a trade association "established by a group of private sector companies to raise awareness and promote a healthy competitive market in the provision and use of public sector information".