Erowid Spirit Vaults : Yoga : Hatha 
Information both spiritual and practical about Hatha Yoga. The balance and mutual influence of the physical and psychic/mental.
http://www.erowid.org/spirit/yoga/yoga-hatha.shtmlDoYoga
Articles, instructions on basic poses, links to yoga resources, inspirational readings, links to affiliated Anusara hatha yoga teachers. Teaching and workshop schedule for Doug Keller.
http://doyoga.com/
Yoga Cards
Hatha yoga instructions with photographs and tips. Included are Yoga sequences for various ailments and hatha yoga art.
http://www.yogacards.com
Yoga Postures
Explains the types of Asana Postures, classification, and best times to practise these positions.
http://yoga-posture.co.in/
