I just finished Flags of Our Fathers by James Bradley and really enjoyed it. This book was released in May of 2000 (just before Father's Day) and I'm sure it was very popular at the time. That doesn't explain why it took me two years to get around to reading it, but I finally did over the July 4th holiday this year.
Overall I really enjoyed the book. My knowledge of Iwo Jima was limited to "the picture" and the fact that we fought the Japanese on some island in the Pacific. Along with learning a lot about the men in the picture, this book gives a good overview of the fight, often in graphic detail.
The book left me wanting to learn more about the war in the Pacific, but in the appendix the author lists numerous sources for further reading.