http://www.himalayaninstitute.org/ The respected yoga institute founded by Swami Rama, where I did my 500-hour teacher training. The on-line magazine, Yoga International, has a wealth of information, much of it free of charge.
http://www.yogainternational.com The best (in my opinion!) site for online yoga classes and lots more!
http://www.yogainthebay.com/ I did my 200-hour yoga teacher training with Veronica, my beloved teacher since 2001. If you live in Brussels or in the UK, and want to deepen your practice and/or learn to teach, you cannot do better than Veronica's rigorous, exhilarating training.
http://www.yogaroots.be My beloved friend and yoga teacher in Brussels - check out her Yoga & Sound Sundays!
Brussels Yoga Co-op
http://www.brusselsyogacoop.com Want to find a teacher in Brussels, know about upcoming yoga events or subscribe to the mailing list? This is an informal network of yoga lovers in Brussels and beyond. Also join the Facebook group: https://www.facebook.com/#!/groups/brusselsyogacoop/
http://www.yogajournal.com Loads of information on yoga asana, philosophy, meditation, pranayama - you name it!Yoga International