Eight Kinds of Yoga
Considers that there are eight main branches of Yoga and explains their meaning.
http://www.yogaworld.org/yogas.htm

Yoga Paths to Health and Enlightenment
An overview to assist in determining the most appropriate tradition with suggested reading.
http://yoga_paths.tripod.com/

Yoga Paths
A beginner's guide to understanding distinct traditions.
http://www.yogamovement.com/resources/paths.html

Erowid Spirit Vaults : Yoga
Spiritual and practical information about the many paths of yoga.
http://www.erowid.org/spirit/yoga/yoga.shtml

Yoga Styles
Overview of common practices; emphasis on meditation.
http://www.crystalinks.com/yoga.html

Choosing a Yoga Style
Overview of the most common styles of yoga.
http://www.yogamovement.com/resources/styles.html

Suddha Dharma
Information on a yoga which is the transcendence of Gnana, Bhakti and Karma.
http://www.suddhadharma.net/