Happy Birthday, Elements of Style!
Sigh: I still suffer from the same problems and forget to live by the simple mantra, "Use the active voice."
If you don't have this book (or if you haven't bookmarked the free, on-line version), you are seriously missing out on some great tools to add to your arsenal. Writing isn't just important. It's essential. It's vital. It's powerful.
(h/t to Professor John J. Pitney, Jr. who, in 1997 - OMG, twelve years ago? I was a freshman twelve years ago? someone give me a paperbag into which I may breathe - required me to purchase and learn from this book and who never failed to provide the accurate page citation to my most common and pernicious stylistic errors.)