PBS
Pbs: American Experience: Admiral Chester Nimitz
This site is a biography of Chester Nimitz (1885-1966), an American admiral during WWII. Site compares him to MacArthur.
Other
National Security Agency: A Priceless Advantage [Pdf]
A report written by the NSA on the U.S. Navy Communications Intelligence and the Battles of Coral Sea, Midway, and the Aleutians in the spring of 1942. Very credible and very complete. (Third edition)
Independence Hall Association
U.s. History: War in the Pacific
The war in the Pacific raged throughout World War II. Read about the Japanese early successes, and see how the American troops recaptured and moved closer to Japan at the end of the war.