U.S. Citizenship Podcast has a ton of resources that are accessible to English Language Learners, and is high on The Best Websites For Learning About Civic Participation & Citizenship
list.

They just posted a wealth of quizzes related to the new U.S. Citizenship Test — they’ll be a huge help to ELL’s and their teachers.

I’ll add the direct link to those quizzes to The Best list, too.