Firstly The British Library is currently hosting an exhibition called Taking Liberties which we intend to visit soon. I've recently discovered that they are also running this excellent interactive site. I encourage you to give it a go.
Also of interest at the moment is the very interesting site from President-Elect Obama's transition team - check out Change.gov where you can subscribe to its RSS feed. What's surprised me most is that they are listening to non-Americans in several of these sub-categories including the very open American Moment and Obama CTO. As if the announcements announcements of the transition team investigation signing statements, environment issues and Gitmo wasn't enough! :-)