Denver SEO Guru

Does anyone know a really good book for Seo (Search Engine Optimization)?

I'm having trouble finding my website any search engine. I just want to know if there are good books that I can buy / get to learn it. There are some software tools that I see on the Internet, but are very expensive. If I go to training, which are more expensive. Please help!

The Best Seo book on the shelf is Search Engine Marketing Inc. is a year or younger, but will give a great foundation. However, to really understant current use SEO and you have to keep an eye on the blogs. Searchengineland.