Vipassana Support Institute 
Information on the basic theory of vipassana meditation, also known as mindfulness or insight meditation. Articles and tapes from Shinzen Young.
http://here-and-now.org/VSIVipassana.com 
Meditation in the Theravada tradition. Online meditation course.
http://www.vipassana.com
Vipassana Meditation 
Instruction in vipassana as taught by S. N. Goenka.
http://www.dhamma.org
Vipassana Research Institute 
Based in Igatpuri, India. Information on the Vipassana meditation technique as taught by S.N. Goenka in the tradition of Sayagyi U Ba Khin. Pages include Vipassana Newsletter and details of courses and centres.
http://www.vri.dhamma.org/index.html
Buddhist Meditation from Thailand 
The fundamentals of meditation by Phra Ajahn Plien Panyapatipo, Wat Aranyawiwake, Thailand.
http://members.tripod.com/arahan/fundamedi.html
A Gradual Awakening 
Excerpts from Stephen Levine's meditation manual.
http://spiritsite.com/writing/stelev/part4.htm
Vipassana 
Downloadable books by Nina van Gorkom and Sujin Boriharnwanaket, and many texts from the Tipitaka.
http://www.vipassana.info
The Vipassana Page 
Site of the vipassana email list.
http://www.enabling.org/ia/vipassana/
The Ganges Sangha 
An extensive collection of articles to support Vipassana practitioners.
http://www.geocities.com/~madg/gangessangha/