Two pages of probability tutorial is at Stat Trek. At the bottom, click on to the next page.
Here is a series of short links to cover topics in probability. You always need one more look at conditional probability and independence..
And for one MORE look at conditional probability, this is a short note with a worked example.
Probability problems are often about Permutations and Combinations... Here is a series of links to reveiw these important counting themes.
For those who are curious, here is a copy of two posts that explain how to find the probability of getting a run of n heads or tails in a row in a series of ten (or any other number) flips.
Here is a little activity called The Greedy Pig. Don't ask who it is named for, don't even think about it; just go and have fun.
Here is a short article on Simpson's Paradox, one of those strange things that can happen with categorical data sets.
And here is a Java applet that will demonstrate the mathematical problem Called Monty's Dilemma.