Here is some of the best of 2008 reading list. There were many and could not include all.
Nobunaga no Hitsugi by Kato Hiroshi
Nobunaga to Kieta Kashintachi by Katsuhiro Taniguchi
Nobunaga no Shireikan by Katsuhiro Taniguchi
Nobunaga no Shineitai by Katsuhiro Taniguchi
The Signore by Kunio Tsuji
Sengoku 10 Daikassen no Nazo by Owada Tetsuo
Weapons & Fighting Techniques of the Samurai Warrior 1200-1877 AD by Thomas Conlan
Nobunaga no Sensoo by Fujimoto Masayuki
'Oda Nobunaga, Guns and Early Modern Warfare in Japan' by Paul Varley
Saga of the Samurai Shingen in Command the Kai Takeda 4 91549-1558) by Terje Solum and Anders K. Rue
There were many more that I have read and enjoyed. I know for a fact that 2009 will have plenty of good reads.
Nobunaga no tame!