The wave of making public data available continues as more countries adopt the model set by data.gov - latest is the UK's data.gov.uk. Expectedly, it did not take long before sectors like transportation and law identified areas to apply the data sources and build apps.
And now "data openness" has hit health care - see and here come the healthcare apps. With infrastructures like Healthvault and Google Health in place like the uptake should be faster and deeper. The question of privacy still remains, but I think once utility increases, so will security and privacy. This is the ultimate bottom-up consumer-centric apps design I had hoped for.