September 24 each year is National Punctuation Day, developed as "[a] celebration of the lowly comma, correctly used quotation marks, and the proper uses of periods, semicolons, and the ever-mysterious ellipsis."
The NPD website contains a list of online and other resources for people interested in learning more about proper punctuation, punctuation playtime activities for children, and products for those who just need a shirt that asks: "Is there a hyphen in anal-retentive?" (Oddly enough, the answer is "It depends.")*
One of my favorite quotes on punctuation comes from Poe:
"The writer who neglects punctuation, or mispunctuates, is liable to be misunderstood....For the want of merely a comma, it often occurs that an axiom appears a paradox, or that a sarcasm is converted into a sermonoid."
Another favorite is from F. Scott Fitzgerald, who advises writers to avoid exclamation points: "An exclamation point is like laughing at your own joke."
*This point is open for some debate, but in my opinion, when used as a noun, the term "anal retentive" does not have a hyphen. When used as an adjective, it does.
She is anal retentive.
She's an anal-retentive proofreader.