It was a very busy week for me with all my seo reading, I took out every book I could find on SEO from my local library. Some of the information I read I had already found on the internet, and have been applying it for some time. The number one tip I found in all the books I read was building links from other sites that are an authority to your niche. There are some good ideas and tips, but most of the information is already on the internet. If you type in SEO for a search you are going to find pretty much everything in these books. These books did bring some insight as why to take certain actions to get a site ready for SEO. In the end I would say that if you can get the books from your local library then do it. If you had to go out and buy all these books, it might be a better idea to try to skim through them at the book store. This will give you chance to decide if you should buy one book over the other.