I totally agree Sharen! I always have a stash of reference books nearby including
The Elements of Style,
Barron's Painless Grammar,
The Blue Book of Grammar and Punctuation,
MLA Handbook,
The Synonym Finder and three different dictionaries. Whew!
Of course, I was an English major in college so some of those are leftovers. I use them all the time, though.
I am always using online resources, too, though. It depends on where I happen to be located because I have a mobile office.