I bought a copy of this book yesterday, and it is wonderful. *The LaTeX Companion will show you how to do the most amazing things with LaTeX. *I was blown away by many of the examples in the book and had no idea that such things could be done!
So my recommended reading list to anyone interested in LaTeX is;
1. The not so Short Introduction to LaTeX
2. The LaTeX companion
Forget about Word and other weakling "word processors". *LaTeX is king.