+1,000,000 for Robin Olds' book... Can't recommend that enough.

I've been holding off on Viper Pilot until I hear some more reviews, I'll probably pick it up here soon though.

Here are some others I would recommend:
Sunday Punchers (about an A-6 attack squadron in the Vietnam war)
First In Last Out (About the Wild Weasels in Vietnam)
Thud Ridge (About Major Jack Broughton's time in 105s during Vietnam)
Warthog (Flying the A-10 in the Gulf War)
Black Aces High (Story of the first USN "Bombcat" squadron over Kosovo)
Hornets Over Kuwait (About bug-drivers during ODS)
A Nightmare's Prayer (A recent book I read... Pretty good account of CAS in Afghanistan)

...And this list doesn't even touch all of the great WW2 books out there. Anything written by Martin Bowman is a guaranteed quality read.