I was talking with some friends a while back and we decided it would be cool to have a wiki version of our US Constitution, where individuals could log in and change the constitution however they liked. It might not be a practicle form of governance, but we thought it would be a fun way to see just how people would change the document. Afterall, half the fun of wiki pages is seeing how articles get changed back and forth when they concern 'hot' issues.
Just recently, I found Congresspedia, a wiki on our US Congress. Check it out. For starters, I reccomend looking up your state senator.