How would one go about moving to Sweden when they are currently a U.S. citizen?

[*Christina]

Serious answers only please! Of course a passport would be necessary. Where would I start to look for the requirements? Do I have to get a work visa? Can I only move there if I'm working? What kind of benefits would I get? When would I become a citizen? How long do I continue to get benefits as a U.S. citizen? How do you get dual citizenship? Do I have to file taxes in the U.S. if I work in Sweden to maintain my U.S. citizenship? Any resources or general pushes in the right direction are super appreciated!! Are Swedes kind to Americans that move there? How common is it for Swedish business to speak english? and the general Swedish public? Where can I learn Swedish quickly? No, I do not have a criminal record and I'm not moving there because of legal or financial problems. What type of government does Sweden have? What's the weather like? (I know -- I can get that info from a great web site -- weather and gov't info will be easy for me to find.)