Here is an interesting ressource: Thearling.com. This is the personal website of Kurt Thearling, an experienced data miner. Kurt has worked on several data mining softwares for many companies up to now. His webiste is a mine of information about data mining. It contains for example interesting white papers such as An Introduction to Data Mining and An Overview of Data Mining Techniques. In addition to a home made tutorial, he proposes a list of books in domains such as data mining, information visualization and CRM. I warmly suggest you to have a look at his webpage if you don’t know it yet.