Zen Koans are awesome! Many of them are simply stating the truth in simple words! :)
Neem Karali Baba was a mystical saint who touched the lives of several well known individuals like Daniel Goleman, Larry Brilliant and Ram Dass (formerly Richard Alpert).
Awesome videos that explain Advaita Vedanta.
Atma Shatkam by Adi Shankaracharya is a beautiful composition that explains Advaita Vedanta. S P Balasubrahmanyam sang it nicely. A translation by Swami Vivekananda in English is available.
Thich Nhat Hanh talks of 'deep listening', 'presence', along with relationship advice for couples.
Awesome explanations of the following simple prayer:
"God grant me the SERENITY to accept the things I cannot change, COURAGE to change the things I can, and WISDOM to know the difference. Thy will, not mine be done."
Mahasi Sayadaw used to teach at Tathagata Center, a Buddhist monastery in San Jose. His instructions on practicing mindfulness are clear.
A collection of resources that address this question.