If you can locate the newest version of The Elements of Style (illustrated) by Strunk / White / Kalman, you can re-read the best book about writing ever published and see for yourself how much better it is with 57 illustrations of sample sentences from the text. It's actually kind of fun to read.
Also worth a look:
The Revenge of Anguished English, More Accidental Assaults Upon Our Language, by Richard Lederer
Ballyhoo, Buckaroo, and Spuds Ingenious, Tales of Words and Their Origins, by Michael Quinion
The New York Times Dictionary of Misunderstood, Misused & Mispronounced Words, Words We Know (until someone asks us what they mean), edited by Laurence Urdang
Good times!
