Here a a few links concerning Learning Objects:
www.imsproject.org/metadata/mdbestv1p1.html
ltsc.ieee.org/wg12/index.html
http://www4.uwm.edu/cie/learning_objects.cfm?gid=55
xml.coverpages.org/scorm.html
www.adlnet.org
...probably much more than anyone would want to know...
mhood