Great guide by The Heritage Foundation to our founding document. Done in top-notch fully-animated HTML and CSS, with in-depth academic essays on each clause.
I’ve only read the essay on The Preamble so far, but I look forward to devouring the rest. For some reason, though, I felt like I was reading passages from The Haggadah on Passover. I suppose you don’t often read explanations of a text which cover a phrase-by-phrase analysis.