If you pay any attention to what's happening in the U.S. around the National Health Information Network (NHIN) you certainly have seen that the U.S. Department of Health and Human Services has posted another RFP for more prototypes to test what was done last year in the 4 prototypes and in HITSP.
At the same time they are making available a Summary Report on NHIN Prototype Architectures.
As you probably also know (in case you don't I'm telling you now), Microsoft was part of the CSC/Connecting for Health (the U.S. one) consortium.
I have talked about this in the past here and here
If you did not have any plans for the weekend, now you do :-)