You can search this electronic textbook for statistics topics including ANOVA, linear regression models, the effects of outliers, confidence intervals, etc. Gives explanations and discusses the topics.
StatSoft

Gives a brief introduction and overview of the fundamental statistic concepts.
University of South Carolina

In this video, Salman Khan of Khan Academy explains the normal distribution.
Khan Academy

In this video, Salman Khan of Khan Academy explains binomial distribution. Part 2 of 4.
Khan Academy

In this video, Salman Khan of Khan Academy explains binomial distribution. Part 1 of 4.
Khan Academy

A helpful scientific calculator that runs in your web browser window.
Holt Online Learning

Flash tutorial with clear explanations about what deviation and variance mean along with how to calculate these by hand, using Excel and using the calculator.
Usable Stats

Very comprehensive list of statistics formulas.
Stat Trek

It also gives formulas, description, etc for statistics.
Wolfram Mathworld

In this video, Salman Khan of Khan Academy explains binomial distribution. Part 4 of 4.
Khan Academy
