As far as books go, "A World at Arms: A Global History of World War II" by Gerhard L. Weinberg is a great book, the best I've ever read about the era. Unbiased, well-written, highly accurate and lays the facts bare. It covers everything in one concise volume and includes a massive bibliography and other additional sources should you want immerse yourself any further.
WWII in HD Color -- 13 British-produced episodes about the war from beginning to end. Mostly accurate and covers mostly everything. A good series with catchy documentary-style music, the only drawback IMO is that it's kind of slow in regular speed -- if you have VLC, I recommend watching it in 1.5x speed.
Soviet Storm: WWII in the East -- Good Russian-produced documentary about the Eastern Front in English. About 12-13 episodes covering the major battles of the Soviet Union in its war against Germany (with one episode covering the war against Japan.)