Jnana Yoga

Pronounced "gyana," Jnana in Sanskrit means wisdom or knowledge. This is the most intellectual branch of yoga and is perfect for those into study (i.e. of yogic texts or scriptures), contemplation, and meditation. With Jnana yoga, you are essentially seeking your eternal self, as opposed to your "temporal ego."

Jnana Yoga A very concise introduction to Jnana Yoga, by Sri Swami Sivananda. Jnana Yoga - Higher Consciousness through Clear Thought Bruce R. Arnold has a number of resources on his site dedicated to Jnana Yoga and related topics.