BuddhaNet : Buddhist Information and Education Network has an extensive worldwide directory of Buddhist resources and a large database of articles on Buddhism, including Vipassana  meditation, Maithri meditation, Buddhist history, Art, Culture, Publications and academic studies.
Beliefnet - A multi religious website with excellent resources.

Buddhistnet : UK Online Buddhist Database. 
Buddhism: An Introduction - Basics of Buddhism.
Buddhism Depot - Buddhist Discussion Forum with additional recourses on other faiths.
Buddhist Information of North America - North America's largest on-line Free Buddhist library.
Buddhist Digital Library and Museum - A wide range of information is available here, both general and technical. The site includes an archives of scholarly articles on various Buddhist topics.
Buddhist Studies WWW Virtual Library - This is the major academic Buddhist archives on the Internet, located at Australia National University.
Buddhism & Dharma studies - Personal Buddhism web portal
DharmaNet International - The first and largest Buddhist web site on the Internet. Online since 1991.

Dharma Organization - The home of IMS and BCBS Vipassana Retreat Center and The Center for Buddhist Studies.
Dhamma Study - Buddhism as the Buddha taught in the Tipitaka
Essentials of Buddhism -Lists out the key points of Buddhism in a nutshell. Provides links to other excellent Buddhist web sites.
E-Sangha - Buddhist Forum
Fundamental Buddhism - Explains Buddha's Teachings in Buddhist Instruction.
Instructions for Daily Dharma Practice -  A non-sectarian program geared to American Buddhists to be used as part of one's daily Buddhist practice.
KarmaNet - Online Learning, Metaphysics, Meditation and More!
Kalavinka Dharma World - Informational web site on Buddhism.
Manjushri Buddhist Online Community - The leading edge of explorations in today's spirituality.
Resources for the Study of Buddhism - Site contains links to both general Buddhist resources and specialized materials on Zen, Chinese Buddhism, Yogacara Buddhism.
Sacred Texts Buddhism - Internet's sacred Buddhist text archive.
The Journal of Global Buddhism - Welcomes submissions, articles, book reviews, of scholarly and community interest from Buddhists around the world.
The Buddhist Society - Buddhism, Dharma talks, Zen, Tibetan, Theravada, Meditation, Buddhist Library.
What is Buddhism - Essential Q/As on the basics of Buddhism