I found a great blog called hangingtogether.org, described as “the hangout spot for libraries, archives and museums”(LAMs).  A group of people OCLC/RLG created the blog to look at the issues relating to these groups, and they’ve been pretty active over the past couple of years.  The publication “Beyond the Silos of the LAMs: Collaboration Among Libraries, Archives and Museums” is an especially interesting look at the various projects and intersections emerging between institutions.