This is a great article by Samuel Dean of Web Worker Daily:
Many of us writerly types spend a lot of time in Microsoft Word, and I even know a few Web designers who like to use it and Microsoft Excel for doing simple site prototyping work. Whether you’re sentenced to use Word all day by a dictatorial IT department, or it’s simply your word processor of choice, you can save time and have more options by mastering a few easy shortcuts.
The seven tips I’ll list here are very easy to learn. They work in most versions of Word, and under Windows or on a Mac:
http://webworkerdaily.com/2007/08/04/getting-the-most-out-of-ms-word/#more-1003