The best books on techniques are probably
1: Drift fishing for steelhead by Bill Herzog
2: Float fishing for steelhead by Dave Vedder
3: Jig fishing for steelhead by Dave Vedder
4: The lastest catch record for steelhead for Washington and Oregon rivers. I know it's published by Amato books but I'm not sure who wrote it. Look in your STS magazines in the book section and you find it in there.