"Strong Men Armed: The United States Marines Against Japan" by Robert Leckie. Yes, the Robert Leckie portarayed in the series the Pacific. http://www.goodreads.com/book/show/1231424.Strong_Men_Armed "Red Sun Setting: The Battle of the Philippine Sea" by William T. Y'Blood Good book for covering the battle, not so much for some of his conclusions. Morrison's "The Two-Ocean War: A Short History of the United States Navy in the Second World War" gives a good general history of naval operations in the Pacific (and the Atlantic/Med). You have to understand the naval war to provide proper context for the ground war, in the pacific they were too interrelated. Has a good short section on the Phillipine Sea.
Not books, but some very good reading here. http://www.ibiblio.org/hyperwar/PTO/index.html And here; http://search.usa.gov/search?utf8=%E2%9C%93&affiliate=cmh&query=PACIFIC+WW2&commit=Search
Two from Barrett Tillman http://www.amazon.com/Carrier-Battle-Philippine-Sea-Marianas/dp/1883809045 http://www.amazon.com/Clash-The-Carriers-Marianas-Turkey/dp/0451219562
I've added Hyperwar to my 'favorites' folder and I put some of the suggested books on my Amazon wishlist, thank you all for the responses.