This is the best place to start to find out about this much talked about number. Dr. Math is a feature of the Math Forum, an online math education community center. This is a good place to clear up many of the common student confusions about pi and irrational numbers in general. Most of the commonly asked questions are answered here in the Pi FAQ and if you don't see your question you can submit it and one of their knowledgeable volunteers will answer it for you. There are also a number of good links here for further exploration. Pilinks is a particularly good one.
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The address (URL) of the current site is:
http://mathforum.org/dr.math/faq/faq.pi.html