Bombers of World War II and Fighters of World War II, both by Metrobooks.
They both have some stupid editing errors (listing aircraft that are not in the book in the Table of Contents and not listing others that are) and lack sections on some major aircraft such as the B-17 and P-38, yet have 2 sections for other aircraft such as the Spitfire and Bf110.
The Great Book of World War II Airplanes by Crescent Books.
Very thick, very heavy book that only covers 12 aircraft, the P-38, P-51, B-17, Hellcat, Corsair, Spitfire, Mosquito, Lancaster, Bf109, Fw190, Ju87 and Zero. Lots of good illistrations, icluding some that are not covered like the A7M2 Reppu "Sam".
Ok, I hedged and got three in there. Its only a bit of my library anyways.

Sisu
Karnak