iCivics is an incredibly rich and well designed site conceived by Justice Sandra Day O'Connor, who has been (rightly) concerned that civics is not well-taught in our schools because teachers lack effective materials (um, and time, Your Honor).

iCivics is a web-centered project designed to help students learn civics and  to be active participants in democracy.

iCivics is a fabulous website that teachers students about US Government. 

What began as the Our Courts Project for middle-school students has now evolved into the more comprehensive iCivics, a resource for educators and parents that teaches about the Constitution, Bill of Rights and the three branches of government through free online game play.