"The History Place" offers brief timelines and pictures of past historical figures, events, and places. Within each of the topics there are many links. The best thing on this site for World War II is the time line.
"Pearl Harbor: Remebered" offers many links including a brief overview of the attack, a map of Pearl Harbor, a time line, and other useful links, including audio links. It is a good site for in-depth information regarding Pearl Harbor.
"A-Bomb WWW Museum" is an excellent sight that offers real-life pictures of Hiroshima before and after the bombing. There are very graphic pictures of the after effects of the bomb, as well. There are also links to personal accounts of the bombing.
"World War II" offers an exhaustive number of links on a broad range of topics related to World War II. The topics range from time lines and maps to POWs and Spies. The site is a good place to do research.
The "Library of Congress American Memory" site offers a glance at authentic documents from World War II. For example, visitors to this site get to see the actual naval dispatch announcing the attack on Pearl Harbor. Also featured is a letter to the designer of the Atomic Bomb from Franklin D. Roosevelt. This site gives students a chance to see documents they might not get to see otherwise.
Blue Webn' offers educators with links to many many useful sights. The sights range from simulations to general research information. Teachers and students can type in a subject or content area and easily conduct a useful search.