Having just finished signing and stuffing Christmas cards with my husband, who, when addressing envelopes, insisted on using an apostrophe to pluralize the last names of our friends and relatives even though I gave him my every assurance as a professional copy editor that it was grammatically incorrect and also annoying, I was tickled to stumble upon the site of the Apostrophe Protection Society -- dedicated, as am I, to the proper use of this essential piece of punctuation. You can stop by for a quick English lesson, see examples of egregious incorrectness on signs and storefronts, and share your personally outrageous finds on a message board. I haven't seen anything like it since I belonged to an e-mail list for copy editors that routinely engaged in flame wars over proper comma placement.
None of this has anything to do with parenting, I guess -- except that, next time your sloppy writing kid tells you nobody cares about grammar no more, no how, you can call up this site and prove that there are indeed folks whose obsession with punctuation far, far exceeds your own. See? Somebody does care.