The Science of Pranayama by Swami Sivananda Online

This is a great book to have online for fast reference. Though written in early 20th century English that can be a little taxing to the reader, Swami Sivananda is always endearing for the service he has rendered by sharing spiritual information to one and all. He has excelled in this and can be considered the second great Hindu saint to open Indian spiritual teachings to the world by explaining and writing in English. His works are not translations but his own wisdom and learning to be appreciated as the teachings of a true enlightened and humble master.

Yoga University in India, Great Website for Yoga Teachers and Adept Yogis

If you are interested in a trully comprehensive traditional yoga study course, then check out Yoga Vidya Gurukul's website and their offerings. The website itself is quite comprehensive with hatha yoga and pretty comprehensive pranayama information. If you are looking to learn yoga in a more traditional Hindu or Indian context, this place looks promising. Do check out their website, yogapoint.com, its information offering is extensive though mainly text based. As a reference for yoga teachers and adept yogis this is a very useful website.

Yoga Teacher Training in Thailand

If you are interested in learning to be a yoga teacher, there are a number of sites available for your consideration in HinduSearchEngine.com. These sites are mainly in India and some in other parts of the world. One of the best one that has received good reviews from participants and professional reviewers is Absolute Yoga located in the ideally Koh Samui Island of Thailand. It is a dream place to learn yoga.