1.  The United States Catholic Conference of Bishops  this site gives you the bishops' documents, the Catechism of the Catholic Church, Bible references as well as a reference to other links regarding current issues and topics of concern within the church.

2.  The Vatican (Good resource for papal documents as well as those from other Vatican offices.  Be aware that you select what language you wish to read the text in on this site! )

3.  Christus Rex  (A good site for papal documents, the Catechism of the Catholic Church [which has a search engine!], as well as other religious sites and topics along with current issues and church statements regarding them)

4.  Some Catholic magazine resources on line are the US Catholic, St. Anthony Messenger, and America Magazine.

5.  The Pope John Paul II Cultural Center in Washington, D.C .

6.  For a quick reference to locate a biblical story or passage, there is the New American Bible.

7.  The United States Holocaust Memorial Museum has excellent information relating to the Holocaust as well as other forms of genocide and moral and social justice issues from both past and present situations in the world. 

8.  Several excellent resources on both moral and social justice issues are the following:  Sojourner's Magazine, and the Office for Social Justice ministry in the Archdiocese of St. Paul and Minneapolis.

9.  The National Catholic Bioethics Center in Philadelphia, PA.

10.  Catholic Relief Services in Baltimore, MD.