One of the best sites I've ever found for doing just that, is "The Founders Constitution", from the University of Chicago and the Liberty Press. Each clause of the Constitution is presented as the Preamble is below, with links to the materials and ideas which the Founding Fathers had in their minds when they wrote it, as well as the arguments for and against that clause by the Federalists & Anti-Federalists during the ratification debates, and also early Supreme Court decisions pertaining to it, followed by commentary by Supreme Court Justice and constitutional scholar, Joseph Story.
Have a look... your liberty and freedom depend upon it.
We the People of the United States, in Order to form a more perfect
Union, establish Justice, insure domestic Tranquillity, provide for the
common defence, promote the general Welfare, and secure the Blessings
of Liberty to ourselves and our Posterity, do ordain and establish
this Constitution for the United States of America.
BTW, as an asnide, did you notice that Google, who puts a special clever background image to celebrate everything from the anniversary of Pac-Man to Arbor day... has nothing for Constitution Day? Shouldn't be surprising I suppose... but it's in good company, they didn't do anything for Easter either.