The Guild for Structural Integration
The Rolf Institute of Structural Integration
The International Professional School of Bodywork 
Hellerwork Structural Integration

International Association of Structural Integrators  Features a directory of schools and continuing education opportunities.
Ida P. Rolf Research Foundation
International Fascia Research Congress  Vancouver 2012.
Leon Chaitow's Website
Robert Schleip's Info Site for Somatic Practitioners

(an incomplete list; updated 5/23/2011)
Axel Schrauder, D.O.  Osteopathy in Deining, Germany (near Munich).
Amber Leigh Burnham  Advanced Rolf SI practitioner, Salt Lake City, UT. Guild faculty.
Elise Purcell  Advanced Rolf SI practitioner, Encinitas, CA.
Eric Jacobson, Ph.D  Advanced Rolfer, Craniosacral Therapy, Gestalt Therapy. Arlington, MA.
Garrell Herndon  Advanced Rolf SI practitioner and Iyengar yoga teacher. San Francisco, CA.
Humphrey Bacchus  Functional Medicine. Oxford, UK.
Jeff Linn  Advanced Rolfer, somatic educator extraordinaire, and "My First Rolfer." Boulder, CO. Guild faculty.
Kima Kraimer  Advanced Rolfer and Rolf Movement practitioner. Traverse CIty, MI. Assistant faculty, Rolf Institute.
Liz Stewart  Advanced Rolf SI and Movement Awareness practitioner. Boulder, CO. Guild faculty.
Ruthie Streiter  Rolf SI practitioner and Yoga for Structural Balance. New York, NY.

K. Pattabhi Jois Ashtanga Yoga Institute  Mysore, India.
Ashtanga.com  Maintains a directory of teachers and workshops.
Annie Pace  Crestone, CO
Ashtanga Michigan  Royal Oak, MI
Ashtanga Yoga Ann Arbor  Ann Arbor, MI
Ashtanga Yoga Center  Encinitas, CA
Ashtanga Yoga New York  New York, NY
Peter Sanson  Hawkes Bay, New Zealand
Te Aro Ashtanga Yoga  Wellington, New Zealand
Yoga Workshop  Boulder, CO

BKS Iyengar
Iyengar Yoga National Association of the United States
Ann Arbor School of Yoga
2011 IYNAUS Regional Conference  Chicago in September

Namarupa  Categories of Indian Thought. A quality online journal.
Bent On Learning  Yoga instruction in the New York City public schools.