If you have the time, do yourself a favor and check out this site: http://www.contactjuggling.com/faq.php
I won't give away what it's about, but the URL should give you some sort of clue. Controversies, books, amusing photos...it has it all.
[from the FAQ]:
Question: I want to learn Contact Juggling what do I do?
Answer: To learn Contact Juggling all you need is a desire to learn and a ball.
I have two. Am I overqualified?