There is a plethora of books, CDs, Web Sites and videos on Yoga, each of them dealing with different facets of the Yogic science. Some of these are listed below:
Web Sites
What is Yoga
http://www.americanyogaassociation.org/general.html
What is Yoga: Definition of Yoga and the Six Branches of Yoga?
http://www.abc-of-yoga.com/beginnersguide/whatisyoga.asp
About yoga by Art of Living Foundation
http://www.artofliving.org/yoga
Yoga Postures: over 100 Yoga Postures
http://www.yogacards.com/yoga-postures.html
Weight Loss through Yoga
http://www.artisticyoga.com/
Books
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Yoga Anatomy by Leslie Keminoff
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ASANAS 608 Yoga Poses by Dharma Mittra
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The Yoga Bible by Christina Brown
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Teaching Yoga Essential, Foundations and Techniques by Mark Stephens
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Yoga Sutras of Patanjali by Shri Swami Satchidananda
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Yoga for Beginners by Mark Ansari and Liz Lark
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Yoga Journal's Yoga Basics: The Essential Beginner's Guide to Yoga For a Lifetime of Health and Fitness [Paperback] by Mara Carrico
Some interesting Videos
Yoga for Complete Beginners - Yoga Class 20 Minutes
http://www.youtube.com/watch?v=0o0kNeOyH98&feature=related
Beginner's Yoga Class 20 Minutes
http://www.youtube.com/watch?v=iTicuDqMuq8&feature=relmfu
Basic Yoga Routine
http://www.youtube.com/watch?v=z0i1BZFcZuE&feature=fvwrel
Yoga Energy Expansion Flow
http://www.youtube.com/watch?v=sYEd3V-c-io&feature=relmfu
Yoga for your Back
http://www.youtube.com/watch?v=DvOBVb-15OA&feature=relmfu
Yoga Breathing Techniques