I've been reading Clara's newsletter weekly and have learned amazing things about yarns. She provides a clear and insightful review of each type; swatching, knitting, washing, blocking, and even putting the yarn to the test of wear and tear. She has compiled her reviews, together with facts about yarn, added how fiber starts out, how it becomes yarn, and what we can do with the yarn, all in a great book.
Another knitting book I use a lot for reference, patterns, and encouragement, is Sally Melville's The Knitting Experience Book 1: The Knit Stitch.
The last book I'll comment on tonight is Arctic Lace (scroll down) by Donna Druchunas. I got the book because we lived in Anchorage, Alaska and I loved it there. I was fascinated by the concept of the Oomingmak Musk Ox Producers' Co-operative and the wonderful Alaskan Native women who run it. And there is the mysterious yarn Qiviut, which comes from the Musk Ox. The lace patterns are beautiful. When I got the book I was still recovering from my concussion and was having problems with visualizing stitches and how they all work together. I sat down with the tutorials in Donna's book, and learned how to read lace charts and was on my way. It was a challenge to me, but in the end I finally was able to understand how different stitches went together, and how to do them. I have purchased some of the precious Qiviut, but have yet to actually knit it into something. It's in the safe deposit box at the bank.