SOA in Healthcare

SOA (Service Oriented Architecture) has many promises which includes providing a bountiful supply of web services to be used internally by organizations as well as externally. Healthcare IT is tied to Patients, Providers, Groups, Insurance Carriers, and Brokers. It seems that SOA should and can play well here. How are you using SOA for Healthcare IT on in Hawaii? What services do you think are most important? What technologies are you using? Lets discuss here.