An excellent book. It's written in a very comprehensive manner. The best thing about this book is that it doesn't enlist jargons to explain mathematics. It's accessible, fun to read and, and above all, practical. It helps you. If you do statistics with R, then you may want to grab a copy of it.
The book, although it says is an introduction, it has sufficiently advanced materials and is a good companion to anyone interested in statistics. People with prior knowledge of statistics can use this as a quick reference. Teachers might find this particularly useful- I mean the teachers of statistics- because the book is written in damn accessible language.