directory -- Meditation Internet Resources
Numerous links on meditation - organizations, teachers & retreat centers.
http://www.holisticmed.com/www/meditation.html

directory -- Yoga Journal Directories
Broad site covering yoga teachers, teacher training, studios, retreats, associations, books, etc.
http://www.yogajournal.com/directory

directory -- YogaFinder
Broad site covering yoga teachers, classes, teacher training, events, etc. Calls itself "the largest yoga directory on the internet."
http://www.yogafinder.com

teacher directory -- All-Embracing Yoga Directory
USA by state, plus broad international coverage.
http://www.yoga-centers-directory.net

teacher directory -- Chicago Yoga Teachers
Chicago area
http://www.yogachicago.com/teachers.shtml

teacher directory -- Iyengar Yoga Teachers
Worldwide
http://www.bksiyengar.com/modules/Teacher/teacher.asp

teacher directory -- Yogadex
Searchable database using various criteria. Gives each teacher their own page with schedule of classes, bio and contact information.
http://www.Yogadex.org