Go check out www.nahit.org/cms.

The National Alliance for Health Information Technology has published a pdf defining PHR, EHR, EMR, HIO, HIE and RHIO. The document is not a technical document and can be read by everyone. Organizations such as NAHIT pave the way for companies such as ours; helping define the scope, the implementations and the future directions.

There is still LOTS of work to be done for all of us. Stay tuned...