Access to Insight - Modern English translations of the Buddha's Teachings.
Buddha Net - Find temples in their Global Directory and many other resources.
Audio Dharma - Stream and download Dhamma talks from many prominent teachers.
Dhamma Talks.net - Audio, video, and digital books from many more, prominent teachers.
Metta Net - Dhamma study and Pāli resources.
Sri Lanka Library - Articles on various aspects of Buddhism.
Dhamma Talks.org - Dhamma Talks & Writings of Thanissaro Bhikkhu
Google Saffron - Search through selected Theravāda Buddhist websites.