I'm going to plug another book from Christian Tobler. Fighting with the German Longsword is a manual that demonstrates a wide range of techniques and moves from the German arts with the longsword. It does so pictorially and with a lot of great accompanying text. My only criticism is that the photos needed more contrast (they all look dark).
Fighting with the German Longsword
by Christian Henry Tobler
ISBN 1-891448-24-2
Copyright 2004, Chivalry Bookshelf