This document summarizes a talk on policy 2.0 and lessons learned from experiences with these tools and processes. It describes the emergence of policy 2.0 since 2005 based on earlier movements in web 2.0, government 2.0, and e-rulemaking. Key tools of policy 2.0 include open data, social networks, and crowdsourcing. While promising, there are still open questions around whether policy 2.0 truly leads to more participation beyond "usual suspects" or new policy ideas. Ongoing work aims to develop frameworks to better evaluate these initiatives.