Tantra.com This site has many information about western Tantra, including teacher list, books and videos, many articles for reading, BBS and personnel ads, and Links to other related sites.
Tantrika International One of the most authentic and orthodox Indian Tantra teaching available in the west. Kriya Yoga, both right and left hand path, seem to be a powerful medicine and should be treated carefully following the guidance.
Maenad's Temple Bonnie Johnston's Homepage. She is the author of [Sex,Magik and Spirit]. She runs mailing list about sacred sexuality, which you can join following the link on her web.