It would be good to expand the scope of this survey to include state and local governments. In my experience, some of the real groundbreaking activity in opening up government information to the public is actually happening in local governments. But it is not well propagated.
I think Tania Lang of Peak Usability in Queensland could be a good person to have involved in this project, as she has built her business around accessibility and discoverability of information in the government sector. Probably better know at this stage in State Government, but good value. We have used Tania a number of times in projects to assess these factors.
It would also be good to include in this project (or establish a separate project for) the development of an objective cross-agency model for establishing the (internal and external) value of information and data holdings, as this is a key driver for enterprise information management and information investment strategies that could lead to greater uptake of Enterprise 2.0 activities.