We received a question a few days ago from a reader who wanted to compare what's written here, and at other blogs, with what the Catholic Church actually teaches. What a great idea! Anyone can write anything on the Internet and it's always wise to backup what you read with your own research.
We've also been asked where Catholic "oral" tradition is written down, if not in the Bible. Clearly we don't continue to pass it all down orally, so where can it be found?
To answer both of these questions, we suggest referring to the following sources. First, the Catechism of the Catholic Church (CCC) is a great study of what Catholics believe. It has a very useful index to help a reader jump right into the topic of interest. You can pick one up from most bookstores. Many websites also allow you to search it online (http://www.scborromeo.org/ccc.htm for example).
The Vatican has many, many documents available to read as well. The English site is http://www.vatican.va/phome_en.htm and the international site is http://www.vatican.va/. Here you can find council documents and other writings that have defined our faith over the centuries.