General Catholic sites 

The Vatican
The Catechism of the Catholic Church
The Catechism of the Catholic Church - search engine
Nazareth Resource Library
New Advent Catholic Website
CatholiCity
CatholicSphere
Eternal Word Television Network
Catholic Conference Schedule - Catholic Resource Center
Mass in Transit - Parish Mass Schedules and Maps for Travelers
Peter's Voice - Catholic audio/visual broadcasting on the internet
The Christian Catacombs of Rome
The New Jerusalem Mosaic - A tour and history of Jerusalem
Catholic Community Forum
The Roman Theological Forum
The Roman Theological Forum Study Guide
Living Tradition - back articles, commentary on Scripture
Catholic Start Page

Bible 

New American Bible
Douay-Rheims Bible

Pro Life & Pro Family Resources

Human Life International
NCCB/USCC Pro Life Pages
St. Joseph's Covenant Keepers - An online resource for Dad's around the world
One More Soul
Couple to Couple League - Natural Family Planning Resources
Natural Family Planning Discussion Board
American Life League
Life Issues Institute
Euthanasia Information
Priests for Life
Catholics United for Life
Retrouvaille - helps heal and renew marriages
Courage Homepage - striving to live chaste lives in accordance with the Catholic Church's pastoral teaching on homosexuality
Domestic Church.com - Bringing the life of the Church into homes and daily lives.
Real Love Productions - Mary Beth Bonacci's site. Dating, the meaning of marriage, sex.

Apologetics

Biblical Evidence for Catholicism
Catholic Answers
Corunum Apologetic Web Page
Et Cum Spiritu Tuo - Catholic Apologetics on the Internet
100% Catholic
Defending the Bride
Matt's Catholic Apologetics Page
Catholic Legate Apologetics
The Real Presence Association 
Christ's Faithful People
The ABC's of Faith
Transporter Information Services
St. Justin Martyr Center for Apologetics
Una Fides - Apologetics for Catholics & other Christians
Christifideles Pizza & Theology Society
Newman Apologetics Resource
Don't Be Fooled By Jack T. Chick Tracts
Gehenna
Sean's Faith Website
Defenders of the Catholic Faith
Catholic Resource Center
Catholic Outlook
Apolonia's Apologetics, Philosophy, & Spirituality
Mark-Shea.com

Catholic Social and Relief Services

Catholic Relief Services
Christian Foundation for Children and the Aging

Diocese, Parish, Monasteries, Convents, Catholic organizations

Diocese of Tulsa
Holy Family Cathedral - Tulsa
Clear Creek Monastery
Knights of Columbus Homepage
Dominican Sisters of St. Cecilia Congregation
Sisters of Mary, Mother of the Eucharist
Institute of Religious Life
Holy Family Institute
Prince of Peace Abbey - A Benedictine Monastery
St. Charles Borromeo Catholic Church - Picayune, Mississippi
Community of Franciscan Sisters of the Renewal

Catholic Support Sites - for Converts and those inquiring into Catholicism

The Coming Home Network (Marcus Grodi)
The Journey Home - past audio programs from this ETWN Television series

Eastern Catholic Sites

Eastern Catholicism
Byzantines dot net
Byzantine Catholic Church in America
Syro-Malankara Catholic Church
Our Lady of Deliverance Syriac Catholic Diocese
Melkite Greek Catholic Church
Maronite Catholic Patriarchal See
Maronite Research Institute
The Eastern Catholic Pastorial Association of Northern California

Religious and Human Rights

Catholic League for Religious and Social Rights
Al-Bushra - an Arab-American Roman Catholic Community
St. Joseph Foundation

Catholic Books, Tapes, Magazines, and Religious Items

Ignatius Press
TAN Books
Envoy Magazine
Magnificat - an outstanding monthly spiritual magazine
First Things Magazine
St. Joseph Communications
Canticle Communications
Gilbert! - A Magazine of G.K. Chesterton
Leaflet Missal Company - Publishers and Sellers of Religious Goods - order a free catalog!
The Rosary Workshop
Aquinas Multimedia Ltd. - Authentically Catholic Books
Mother of our Savior Company
The Catholic Shopper
Vatican Art
The Neumann Press - Traditional Catholic books and homeschooling books
Blessings Catalog - Nun dolls and other religious gifts
Pacific Heritage - Statues and religious items

Catholic News

Catholic World News
Zenit News Agency
Vatican Information Service
The Wanderer Newspaper - America's oldest Catholic weekly newspaper

Catholic Church Documents

Papal Encyclicals Online - Extensive collection of writings of the Popes
St. Michael's Depot - documents of the Church councils, papal encyclicals and letters, writings by saints, etc.
Vatican II documents
Council of Trent Canons and Decrees
Early Church Fathers - Wheaton College
Early Church Fathers - New Advent Supersite
Summa Theologica - St. Thomas Aquinas
Catholic Encyclopedia
2000 Years of Catholic Writings
The Franciscan Archives - the writings of St. Francis of Assisi and the Franciscan Order
General Instruction of the Roman Missal (GIRM)

Catholic Youth Organizations or Products

Life Teen
You! Magazine

Catholic Schools, Colleges and Universities

St. Gregory's University - Shawnee, Oklahoma
Christendom College
Franciscan University of Steubenville
Thomas Aquinas College
Benedictine College in Atchison, Kansas
Mount St. Mary's Seminary
St. Joseph Catholic School - Muskogee, Oklahoma

Relics, Eucharistic Miracles, Eucharistic Devotion, Apparitions

Saints Alive - Authentic Relics of the Saints
The Real Presence of Christ in the Eucharist
The Shroud of Turin Website Homepage
Holy Shroud Guild
Catholic Apparitions of Jesus and Mary

Prayers, Devotions, Prayer Organizations

Catholic Prayers
The Rosary
Virtual Rosary
Prayerful meditations - Daily Scripture readings
Welcome to the Mass
The Catholic Mass Home Page
Presentation Ministry - Veritas - A bible reading plan and daily reflections
Via, Veritas, Lux! - extensive information on sacramentals
The Rosary Center
The Rosary - many useful links and information on the Rosary
Examination of Conscience for Confession