It's part of our duty as citizens, in my opinion, to educate ourselves about the Constitution of the United States -- in fact, we should know it through-and-through. Just today I discovered an excellent tool for the task: The Heritage Guide to the Constitution.
The Guide presents the complete text of the Constitution, of course, hot-linked to explanatory notes and illuminating essays. I especially like the Teacher's Companion to the Guide, each section of which can be saved as a pdf.
It's fair to point out that the The Heritage Foundation, which publishes the Guide, is a think tank devoted to formulating and promoting "conservative public policies based on the principles of free enterprise, limited government, individual freedom, traditional American values, and a strong national defense."
I've added a permanent link to The Heritage Guide to the Constitution in the right-hand column of KintlaLake Blog.