Health 2.0 refers to the application of Web 2.0 technologies and principles to healthcare, including personalized search tools, online health communities that share information, and new interfaces and analytics that unlock health data. The document outlines the current state of Health 2.0 with search, communities and tools, and predicts future directions such as better integration of these areas and new "unplatforms" that bring together applications and data across different services. The goal is more engaged patients and improved healthcare through leveraging collective knowledge and data.