We the People: A Call to Take Back America -- written in a comic book fashion, but with so much great info & history. A quick but very informative read! Would be good for kids aged 10 & up.
http://www.amazon.com/exec/obidos/tg/detail/-/1882109384/qid=1103580715/sr=1-2/ref=sr_1_2/104-3147115-3787107?v=glance&s=booksUnequal Protection: The Rise of Corporate Dominance & the Theft of Human Rights -- I'm about 1/2 way through this book. Should be required reading.
http://www.amazon.com/exec/obidos/ASIN/1579546277/qid=1103580715/sr=2-2/ref=pd_ka_b_2_2/104-3147115-3787107What Would Jefferson Do? -- this one is next on my list.
http://www.amazon.com/exec/obidos/ASIN/1400052084/qid=1103580715/sr=2-1/ref=pd_ka_b_2_1/104-3147115-3787107...and last,
The Last Hours of Ancient Sunlight: Revised and Updated : The Fate of the World and What We Can Do Before It's Too Late -- different than the books mentioned above, but a GREAT READ!
http://www.amazon.com/exec/obidos/tg/detail/-/1400051576/qid=1103580715/sr=1-3/ref=sr_1_3/104-3147115-3787107?v=glance&s=bookson edit: He has more books than just these, but they are the ones I've read, am reading or will be reading very soon.