Math Goodies probability lessons

Contains basic explanations with lots of worked-out examples and some online exercises.  Some of the lessons are only available on their CD-ROM.

http://www.mathgoodies.com/lessons/vol6/intro_probability.html

Statistics and probability interactive activities

Including different graphs & plots, experimental probability with dice or coins or spinner, conditional probability with a boxes-and-marbles experiment, sampling with and without replacement with a draw-marbles experiment, the famous MONTY HALL! and more.
http://www.shodor.org/interactivate/activities/#pro