To learn more about various aspects of the Yin-Yang Symbol, and the Taoist philosophy that it represents, I recommend the following essays:
Introduction To The Yin-Yang Symbol. A look at what makes Taoism's approach to working with opposites - as a fluid and ever-shifting "dance of opposites" - such a liberating one.
Gender & The Tao. A closer look at the masculine/feminine polarity, and the role of women in Taoist practice.
Polarity Processing Techniques. Specific practices - utilizing journaling and meditation - to help us relate to opposites in the way suggested by the Yin-Yang Symbol.
Taoist Cosmology. How do Yin & Yang relate to qi (chi), the Tao, and the Five Elements? This is Taoism's story of the creation and maintenance and continuous transformation of the universe.
Tonic Gold Alchemical Elixir. This wonderful herbal/alchemical supplement catalyzes and supports the flow of energy within the central channel (aka Chong Meridian) of our bodymind - the location within the yogic body where all polarized states of mind are resolved into the "dance of opposites" represented by the Yin-Yang Symbol.
Of Related Interest:
EarthCalm's Scalar Resonator and Scalar Home Protection System are wonderful resources for keeping our body's energetic system (i.e. the acupuncture meridian system) strong and balanced in the face of the sea of man-made EMF's that we now live in. Highly recommended!