The Yoga Sutras of Patanjali – A New Edition, Translation, and Commentary: Edwin Bryant
This is my favorite translation and commentary on the Yoga Sutras. Edwin Bryant writes with a deep understanding of the tradition and as a scholar, but it is not so scholarly that it is incomprehensible to the layman. Bryant is professor of Indic Religions at Rutgers University.
The Yoga Sutras of Patanjali: Sri Swami Satchidananda
This is a short, accessible translation and commentary by Sri Swami Satchindananda with an insightful introduction. Swami Satchindananda is a world-renown yoga teacher. Much of his material and teachings can be found at swamisatchidananda.org.