Bayes' Theorem Illustrated
Bayes' rule is quite easy to understand as a Venn diagram, though the linked article doesn't seem to use this fact. But here's a blog-post that does: <a href="http://oscarbonilla.com/2009/05/visualizing-bayes-theorem/" rel="nofollow">http://oscarbonilla.com/2009/05/visualizing-bayes-theorem/</a>