Possibly the coolest app I have seen. . .
http://sunlightlabs.com/blog/2009/congress-theres-an-android-app-for-that/ The features:
•Read the latest bills, laws, and see what bills were recently voted on.
•Find members of Congress by using your phone's location, a zipcode, a last name, or a state.
•Read tweets and watch videos from members' Twitter and YouTube accounts.
•Reply to a member of Congress on Twitter from within the app, using your own account.
•Read the latest news about them, using the Yahoo News API.