http://www.swamij.com/
A very nice site by Swami Jnaneswara with
lots of spiritual information based on the teachings of Swami Rama. Of
particular interest is the detailed commentary on Patanjali Yoga Sutra.
Yoga Movement — An online magazine about the practice of yoga and meditation. Includes articles, texts, a directory of top yoga sites, a listing of yoga centers, and helpful resources.
Below are some great resources on Yoga Sutras of Patanjali:
Commentary on YSP Pretty detailed - no author
name mentioned! http://www.rainbowbody.net/HeartMind/Yogasutra.htm
Compendium of translations by various authors collection of translation
by famous authors and additional commentary http://www.bindu.freeserve.co.uk/yoga/yogasutra/ys1_comments.htm#sutra1.2
Essays on YSP A decent collection http://www.atmajyoti.org/essays_yoga_sutras_1.asp
Heart of Yoga by Alice Christensen Transcript of her book on
yamas and niyamas http://http://www.americanyogaassociation.org/Heart%20Contents.html
Links to YSP translations A large collection of links
to translations by various authors in different languages http://hrih.hypermart.net/patanjali/archive
YSP related downloads useful material on YSP from
SwamiJ site http://www.swamij.com/downloads.htm