The promised Google Health resource is slowly arriving - there's a login screen but nothing behind it at the moment that we can get to.
There is a promised tour, but that's not available yet either. From the look of the options it's going to be very US based. Lots of sharing of personal data with the Google system as well, which I think is going to be the interesting point here. We've talked before about how much people share, what they let others see, the role that Gmail has in automatically taking computerised sneaks at your private email - well it doesn't get much more personal than letting Google know how sick you are!