The Mass from St. Ann's Basilica
Online readings and interaction with Masses at the Basilica of the National Shrine of Saint Ann.
http://www.themass.org/

Liturgy
Introduction to a nonthematic method of liturgical planning, guide to planning for Advent and Christmas, outline of an existentialist approach to liturgy.
http://www.creighton.edu/~rocsj/

The Catholic Calendar Page
Database of readings, liturgical colors, and feast days for the Mass. Users can request dates far into the future.
http://www.easterbrooks.com/personal/calendar/

RomanRite.com
Information, news, and the site owner's opinion on recent developments in liturgical law for the Latin rite.
http://www.romanrite.com/

Lectionary
Short explanation of the Lectionary for Mass, and of the Church year, by Kay Murdy.
http://www.daily-word-of-life.com/lectionary.htm

The Liturgy Planner
Worksheets for planning the liturgy for Sundays and solemnities. Includes model intercessions, music suggestions from several publishers. Information on subscription to the print publication.
http://members.tripod.com/theliturgyplanner/

General Instruction of the Roman Missal
Editio typica altera of 1975. Full text, with concordances and word frequency lists. Each section in its own file.
http://www.intratext.com/X/ENG0012.htm

The Saint Lawrence Press
Publishers of an all Latin Ordo Recitandi (a detailed liturgical calendar) for the classical Roman Liturgy. Calendar comparisons by month are available showing how the 'Tridentine' rite compares with the rite of Pius XII, John XXIII and Paul VI.
http://ordorecitandi.com

Southwest Liturgical Conference Study Week
Annual gathering of liturgical commissions of the Catholic dioceses of seven states in the southwestern United States. Site features registration information and various details about the conference.
http://www.swlc.org/

Bishops Committee on the Liturgy
A standing committee of the United States Conference of Catholic Bishops. Selected documents, excerpts from newsletter, and FAQs.
http://www.usccb.org/liturgy/

Liturgical Studies and Liturgical Music
Annotated directory. Leans toward the historical, scholarly side. These links encompass many different rites of the Catholic Church including the Eastern rites. There are also some links to some Protestant music and liturgy links.
http://www.users.csbsju.edu/~eknuth/itr/ltgy/index.html

The Practice of Jesus
Commentary on the Lectionary readings for Sundays and Holy Days of the Year of Mark, with other resources that might be useful for liturgical leaders.
http://home.clear.net.nz/pages/bfletch/index.html