Gov 2.0 isn't just publishing legislation to the Internet. NZ learnt that lesson with an exercise that closed after 8 days, as mentioned on the Gov 2.0 blog. Matt highlighted was that only some of the initiatives were a fail, for example, "Safe as" (http://www.safe.org.nz/ , I think).
Andrew touched on the difference between useable (can be used in the context for which it is designed/provided) and useful (actual provides some benefit).
Looking to the future, how do you open government services to be delivered on a 128x128 screen (ie, most common mobile screen format). He then moved into augmented reality, for example wikitude.
Broke 2020 down to pretty sure, maybe, and not too sure. Gov 2.0 will be integrated into everyday life, community organisations will be more pervasive and effective through online collaboration. Privacy, security and confidentiality will be far less important issues. Personal information (medical, financial, education) will be managed as a joint ownership between citizen and government.