Two videos, each less than 3 minutes long, provide a top level view to the benefits of standardized data exchange. I really like their emphasis on building the exchanges from multiple community sources and assisting stakeholders in understanding each other.
Recently we completed a web service based exchange of referrals among four agencies. Not an insignificant amount of work, but considerable benefits including faster, less costly processing. Comprehensive notification, local and shared logging ensures end to end accountability.
NIEMs also has extensive technical information on the Human Services domain that is very valuable to anyone working on application development, data exchange standards, or shared systems.