I think we all agree that it will be a challenge in introducing web 2.0 in the government.
Below are some links from a friend of mine that is thinking on doing her PhD in Gov 2.0.
I hope you can find these sources interesting and helpful for your assignment.
The link below is very interesting. It has names of different departments and agencies in Australia using web 2.0 tools. In each of these departments, there is the tool used, its objective, results of its used, lessons learned and the direct contact person on the matter.