1) http://www.kpjayi.org/
Ashtanga Yoga Research Institute, Mysore. Includes a list of certified and authorised teachers as well as information about studying in Mysore.
2) http://www.astangayogalondon.com/
The main Ashtanga Yoga shala in London, where Hamish Hendry teaches.
3) http://yogasouk.com
The website of the center holding regular Mysore style classes here in Beirut.
Ashtanga Yoga Beirut 