Sources as varied as Google's Chief Economist Hal Varian and threatening online personalty (offensive language warning) Zed Shaw have recognized a growing need for professionals with solid statistical skills to meet the technical challenges facing the world today. There are a number of great online resources available for learning and reviewing statistics. Find enough of these bargains and you can justify buying a Kindle or iPad :) ...
Elements of Statistical Learning by Hastie, Friedman and Tibshirani is a large download (
Introduction to Statistical Thought by Michael Lavine is a practical guide that includes examples in R available online only.
The Electronic Statistics Textbook has been available online for a number of years. It is formatted as well organized HTML, rather than simply being a print version of the book available online. It has also been consolidated into a printed version titled "STATISTICS Methods and Applications."
The UCLA Statistics E-Book is a wiki created by the Statistics Online Computational Resource.
Some of the books available online include interactive components. The Online Stat Book includes experiments that a user can participate in and view the results (such as a test that analyzes the time required for a user to click a large and small button on the screen).