Fly Tying Books
I'd strongly recommend the "Orvis Fly Tying Guide" (not to be confused with a much smaller book the "Orvis Fly Tying Manual"). It covers the basic trout flies; dry, wet, nymph, streamer, terrestial and even a few salt water patterns too. The back section of the book contains patterns for every fly in the Orvis catalog. It's a wonderful book for a beginer. Coupled with Al Campbell's tutorials on this site, which are some of the finest fly tying instruction period, they should get you a long way.
After that, the next book to buy would be the "Fly Tyer's Benchside Reference". Nothing compares to that one. But make sure you enjoy tying before purchasing this one - although it's without question the definative book on fly tying, it's also one of the most expensive, retailing for $100, although you can find it for significantly less on sites like Overstock.com, etc.
Happy tying!
-Darryl
My one wish is that when I die my wife doesn't sell my fishing stuff for what I told her I paid for it...