Years ago, I bought and enjoyed reading Writing to Win by Steven D. Stark. Besides giving good advice about writing generally, that book also touched on every aspect of legal writing: briefs, discovery, correspondence, memos, contracts, and e-mail.
Steven now has an updated and revised edition of Writing to Win. Why the new edition? Because the world has changed since the first edition was published in 1999. Technology is more pervasive; people get their reading material on computer screens, smart phones, tablets like the iPad, and various other e-readers. These changes in the way readers read require corresponding changes in the way writers write. So Steven has revised and updated his book to help lawyers write more effectively in this new and continually changing age.