The Sunfishes by Jack Ellis. Great book about fly fishing for bream written by someone who loves both. I bet I've read this book a dozen times.
Piscatorial Absurdities by Joe Robinson. Fly fisherman writes about ultra light spinning and does an excellent job.
Serious Flyfishing by John Waite. One man's opinions on how to fly fish. They're very good opinions.
Backcountry Fly Fishing in Saltwater by Doug Swisher. Title says it all, written by a master.
American Coarse Angling by Brook Landis. Fly fisherman discovers European coarse methods work great for American fish.
Fishing for Buffalo by Rob Buffler and Tom Dickson. Fishing for carp, suckers, buffalo and other "trash" fish is fun.