Woe Is I : The Grammarphobe's Guide to Better English in Plain English by Patricia T. O’Conner is a humorous (yes, humorous) guide to good grammar usage. According to O'Conner, "There's nothing much to punctuating a sentence, really, beyond a little comma sense. Get the commas right, and the rest will fall into place."
Download a free, weekly podcast of Grammar Girl Quick and Dirty Tips for Better Writing from iTunes. Mignon Fogarty (aka Grammar Girl) is an expert at explaining the often confusing world of tenses, parts of speech, and punctuation. Look for her book, Grammar Girl Presents: The Ultimate Writing Guide for Students, in the Library’s teen collection.
Enter the National Punctuation Day Essay Contest or try one of these other How To Celebrate National Punctuation Day activities.