Free guided meditations from UCLA:
Each week has a different theme, and usually includes some introductory comments, a guided meditation, some silent practice time, and closing comments. Presented by the UCLA Mindful Awareness Research Center.
UCSD Center for Mindfulness:
Guided audio files for practicing Mindfulness-Based Stress Reduction (MBSR) from the UC San Diego Center for Mindfulness.
Basic meditation with Tara Brach
Free meditations that you can stream or download.
Contemplative Mind in Society
Guided practices from Mirabai Bush, the center’s director, Diana Winston from UCLA’s Mindfulness Awareness Research Center, and Arthur Zajonc, president of the Mind & Life Institute.
Insight Meditation Society
Selected talks, podcasts, and audio streams, including various lengths of guided meditation.
John Kabat Zinn on youtube: Professor of Medicine Emeritus and creator of the Stress Reduction Clinic and the Center for Mindfulness in Medicine, Health Care, and Society at the University of Massachusetts Medical School.