Mindrolling Jetsün Khandro Rinpoche (birth name Tsering Paldrön, born August 19, 1967) is a rare example of a female Tibetan Buddhist lama.
Khandro Rinpoche Online Teachings:

Buddhist teachings of Lama Thubten Yeshe, Kyabje Lama Zopa Rinpoche and other great Tibetan Lamas of our time
Lama Yeshe Wisdom Archive – Tibetan Buddhist Internet Radio is an MP3 radio station and download archive for Tibetan Buddhist teachings. Most of the content is in English.

Tara Brach – Meditation, Audio Dharma, Podcasts. Tara Brach is a leading western teacher of Buddhist meditation, emotional healing

Audio Dharma – Audio Dharma is an archive of Dharma talks given by Gil Fronsdal and various.

Dharma Seed

Noah Levine’s Against The Stream Buddhist Meditation Society

Awakening, Buddhism, Theravada, Meditation

Dharmapunx NYC and Brooklyn
 – Dharma talks by Josh Korda on the Bowery, NYC and at Greenpoint, Brooklyn

The Portland Insight Meditation Community –

iTunes has numerous great free podcast resources.