EWTN – EWTN is a global, Catholic Television, Catholic Radio, and Catholic News Network that provides catholic programming and news coverage from around the world. Check out their radio schedules which can be streamed online and all over the world.
Catholic Answers Forum – A Catholic Apologetics site. Catholic Answers to your questions about Catholicism. This is a fantastic resource!
Life Teen – Life Teen is a movement within the Roman Catholic Church, Life Teen leads teenagers and their families into a deeper relationship with Jesus Christ and His Church. Perfect for teens and youth group leaders! Steubenville conferences offers outstanding retreats for teens and adults.
The Vatican – Official Vatican homepage.
Catechism of the Catholic Church – A catechism is the name given to a written work that contains a summary of all the beliefs of the faith that is used as a teaching tool.
As for the rest – this is a great article that lists the above and a bunch of other great resources including a good family movie site!