Centering prayer is a method of contemplative prayer popularized by William Meninger, Basil Pennington and Thomas Keating, Trappist Monks of St. Joseph’s Abbey in Massachusetts, in the 1970s. It is grounded in the teaching of earlier works such as The Cloud of Unknowing.
Here are a few sites on centering prayer that you may find of interest:
The Method of Centering Prayer by Thomas Keating. “Centering Prayer is a method designed to facilitate the development of contemplative prayer by preparing our faculties to cooperate with this gift.”
Contemplative Outreach. “Contemplative Outreach is a spiritual network committed to living the contemplative dimension of Christian life through the practice of Centering Prayer.” Contents include weekly articles by Fr. Thomas Keating.
Kyrie Centering Prayer Index. Contains articles by Basil Pennington and Thomas Keating
Curious Christian 
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