Yesterday - while I was taking a day off skiing with my wife and daughter - we announced our plans around openness and interoperabiity for HealthVault.

I'm pretty excited about this. I'm especially excited about making the current .NET client library available under the Microsoft reference license, as I remember how useful it was to step through the MFC or ATL source when I was trying to figure out how things worked (or, more usually, what I had done wrong).