"English is a glorious invention, one that gives us endless possibilities for expressing ourselves. Grammar is there to help, to clear up ambiguities and prevent misunderstandings. Any "rule" of grammar that gets in the way or doesn't make sense or creates problems instead of solving them probably isn't a rule at all. And, as this book's whimsical title hints, it's even possible to be too correct. While "Woe is I" may appear technically correct (and that's a matter of opinion), the expression "Woe is me" has been good English for generations. Only a pompous twit -- or an author trying to make a point -- would use "I" instead of "me" here."
[I bought this book because I saw myself in the Garrison Keillor blurb on the cover: "You forget so much about English as you go along being profound in it, like who a gerund is and where adverbs go, until one day you stand up to receive your honorary LL.D. and children snicker at your grammatical errors. Woe is I can save you from that."]