The ADL is hosting a CORDRA event this Fall in Memphis, CORDRA at Work. Folks building content for the US Dept. of Defense and government agencies will want to get to know CORDRA as it will likely be a big part of future online training content.
CORDRA (Content Object Repository Discovery and Registration Architecture) is an architecture and specification for registering content in a repository, and being able to do searches across repositories. CORDRA leverages The Handle System to resolve unique, persistent resource identifiers, to handle authentication and more. The simplest explanation I've heard of Handle is that it is "A better DNS system than DNS." The Handle System is being handled by CNRI and is funded by DARPA, the good folks that brought you things like the internet