Institute of HeartMath 
A nonprofit research and education organization offering prevention and intervention strategies for improved emotional health, decision-making, learning skills and violence reduction in families, schools and communities.
http://www.heartmath.orgHeaven on Earth
Courses, workshops and tapes of meditations for spiritual growth channelled by Christopher Sell. Northumberland, England, UK.
http://www.heaven-on-earth.co.uk/
Golden Sufi Center
Naqshbandiyya-Mujaddidiyya Order of Sufism. Naqshbandi Sufis are known as the "silent Sufis" because they practice the silent meditation of the heart. Meditation groups worldwide. Inverness, California.
http://www.goldensufi.org/
Heart Meditation on God
This Heart Meditation teaches how to access the mystical heart from a New Age perspective.
http://www.goddirect.org/prose/writings/november/heart.htm
Straight from the Heart: Thirteen Talks on Meditation"
A collection of Thai Buddhist lessons on developing an open heart by the Venerable Acariya Maha Boowa. Also includes an introductory glossary of Buddhist and meditation terminology.
http://www.accesstoinsight.org/lib/thai/boowa/straight.html
Institute for Applied Meditation
Offers online instruction, workshops and retreats in heart-centered meditation. Includes articles on the technique and its effects on achievements, relationships, and health.
http://www.appliedmeditation.org/
