The fine folks at Pew have put together this neat map that allows you to scroll over and see public opinion results about the U.S. in general and specific political actors in particular, such as Bush or Obama. Useful not only for political types but also if you work in public relations, journalism, or plan to travel abroad for holiday.
Only thing missing is an option for missile attack. Click on a country that doesn't like us, then press "launch" and watch the fun. No doubt that'll be in version 2.0.
Push the "change" button and check out the countries that think our change has been for the worse. Damn interesting, I think.