A Cry of Love: A meditation on the Passion, told in the first person.
Awaken to Prayer: How to Pray As a Catholic: Includes history and practical advice. Draws on the riches of (Eastern) Orthodox as well as (Western) Catholic spirituality.
Between the Clouds: This (31 Day / Complimentary) "Rudder" attempts to weave the Christian contemplative tradition seamlessly with developmental psychology, anthropology and physics.
Busted Halo: Sponsored by the Paulists and written by young adults for young adults. Includes discussion boards on various topics, a Flash trivia quiz, guides for seekers.
Daily Virtual Retreat: One-way (read only) electronic mailing list. With different themes for each month. Short Scripture quotes and comments provide food for further meditation for each day.
Invisible Monastery: International, multilingual online group of Catholics who believe in the power of prayer, and who commit to praying weekly for each other's special intentions.
Listening to God in Prayer: Booklet by a Filipino Opus Dei priest teaches a simple way of prayer as a conversation with God.
Online Ministries: Includes daily reflections on readings for Mass, an online retreat, tips for praying, and Stations of the Cross. Based on Jesuit spirituality. From Creighton University.
Pray with the Heart: Litanies, novenas, the Way of the Cross, and other Catholic prayers.
The Nine Ways of Prayer of St. Dominic: Many of these famous "ways" of prayer have to do with posture, using our bodies in prayer.
The Spiritual Exercises of St. Ignatius of Loyola: A classic. The Ignatian method of prayer uses visual imagination to draw nearer to God. Intended for spiritual directors or retreat masters, but "directees" can benefit from this book as well.