The Yoga Alliance is an organization that registers yoga teachers. Registration can take place on two the 200 and 500 hour levels. Finding a teacher who is registered assures you that they have studied everything from philosophy, anatomy and physiology, asanas, teaching methodology, ethics, and techniques. Julie Lusk has obtained registration at the highest level possible. The following will link you to different schools and approaches to yoga.
Most sites have reliable information on yoga in general.
Atma Yoga whose founder is Christopher Baxter. He is an incredible teacher and offers an awesome yoga teacher training that is full of soul. Himalayan Institute and the home of Yoga International Magazine Integral Yoga whose founder is Swami Satichananda. Guided Imagery Health Journeys , by Belleruth Naparstek is the very best place to go for information and research on guided imagery. Ingrid Bacci has an interesting book called Effortless Living .