Key Readings
NMC's Learning Object Initiative
http://www.nmc.org/projects/lo/index.shtml
Three good papers: one theoretical, one an overview, and one a guide for authors. Lots of excellent links and further readings.
Further Reading
Learning Objects are much discussed in various journals, newsletters, blogs, and within the instructional technology and design literature. We are building a database of links to such readings, the raw materials of which can be found at http://rlo.blogspot.com.