I would also recommend Nafziger's huge OOB collection.
The collection has OOB from 1938 to 1945
It has extensive OOB for specific campaigns and theatres.
They are first sorted by year:
939: 1939
945: 1945
Then sorted by nation:
A: Allied
B: British/Canadian
C: Chinese
F: French
G: German
I:     Italian
J: Japanese
K: Rumanian
P: USMC/Indian
Q: Finland
R: Russia
You can search the OOB, or download a complete list of what’s available here:
http://www.cgsc.edu/carl/nafziger.htm
The complete list of OOB is here:
http://www.cgsc.edu/carl/nafziger/index.asp
Manuals
The Research Library also has technical manuals for various weapons and equipment (mostly US) found here:
http://www.cgsc.edu/carl/wwIItms/index.asp
And tactical and weapon handbooks for various nations here:
http://www.cgsc.edu/carl/wwIIspec/index.asp
Which includes the following titles:
1 British Commandos 
2 The German Armored Army 
3 German Military Training 
4 The German Motorized Infantry Regiment 
6 Artillery in the Desert 
7 Enemy Air-Borne Forces 
8 German Tactical Doctrine 
9 The German Squad In Combat 
10 German Antiaircraft Artillery 
11 Morale-Building Activities in Foreign Armies 
12 German Military Abbreviations 
13 British Military Terminology 
14 German Infantry Weapons 
15 German Coastal Defenses 
17 German Doctrine Of The Stabilized Front 
18 German Winter Warfare 
19 Japanese Infantry Weapons 
20 German Ski Training And Tactics 
21 German Mountain Warfare 
22 Company Officer's Handbook Of The German Army 
23 Index to Intelligence Publications 
25 Japanese Field Artillery 
26 Japanese Tanks and Tactics 
27 Soldier's Guide to the Japanese Army 
29 Japanese Defense Against Amphibious Operations 
32 Japanese Parachute Troops 
34 Japanese Tank and Antitank Warfare 
35 German Methods Of Warfare In The Libyan Desert 
Cross