Niket Kaisare has written a wonderful and lucid guide on how you can use Microsoft Word to make your life easier when it comes to writing neat and structured documents.
Being a Word user, I use a lot of those ideas myself but Niket explains them in a very simple and succinct guide. It looks like the theme of separation of style and content pervades through everything he does. A lot to learn for a lot of us on that front.
Leave him a note if you find it useful.