The Vatican website.

The website of the Holy Father, with church documents

U.S. Conference of Catholic Bishops

The US Bishops (USCCB) web page

Catholic Internet Directory

A networking directory to aid church communications, this site is thoroughly researched with an extensive links facility

Catholic Online

Overall information of Catholic agencies and organizations

World Council of Churches

Site for the 330 church strong council that includes details of its aims together with a list of member churches