Today, Sept. 24, is National Punctuation Day, a holiday invented three years ago by Bay Area copywriter Jeff Rubin to remind corporations and schoolchildren that "a semicolon is not a surgical procedure." On the NPD website, you can click on punctuation symbols to learn their proper use, discover how best to celebrate NPD (Step 1: "Sleep late"), and download a recipe for Punctuation Meat Loaf (which I expected to contain a teaspoon or two of Mrs. Dash, but it doesn't).
If you're feeling especially celebratory, you may wish to read Michael Sheehan's post, "Die, Exclamation Point!!!!!!!!!!" I've written a few posts on punctuation myself.