PearlDiver specializes in taking in very large patient datasets and organizing the data so that sophisticated questions can be answered in a very small amount time by domain/medical experts without needing the help of a data mining or database expert.
The Semantic Community is (1) working to create an interface to health data infrastructure results like Pearl Diver produces and (2) is working with Clear Government Solutions to get that in their certified and secured Government Cloud as it has done recently with GeoEye for the Geospatial Community Cloud.