Picked up Shattered Sword myself today, great so far.
A great but not frequently reviewed book is "A Thousand Shall Fall" by Murray Peden, which is strange as many well known authors and critics have lauded it as one of the best books on the night bombing campaign in Europe written. The Amazon page reviews speak for themselves, as do those who wrote forwards/review clips/etc for the print copies of the book. Very well written book, a lot of insight into the Sterlings, Fortress, and Lanc bombers, as well as some really specific missions like early ECM stuff which the author did.
Shattered Sword is a somewhat newer book on this subject, probably one of the reasons why I hadn't heard of it until this thread, truly truly excellent so far about 1/4 way through. I have it in both print and epub, if anyone wants to borrow it PM me, well worth the read IMO, and good timing too, as the 75th anniversary of the Battle of Midway is in a week.