Yes, her order is still in operation, as well as an established off-shoot.
http://www.innerlight.org.uk/
http://www.lvx.org/about.html
Middle Pillar was a ritual of the Stella Matutina and Regardie recommended it only be done with supervision. It can indeed be very powerful. The Stella Matutina and the Alpha et Omega were the two temples which emerged out of the dissolution of the original Order of the Golden Dawn. The Alpha et Omega continued in the traditional manner under the guidance of Mathers while the Stella Matutina was formed by Dr. Robert Felkin (who was a very strong Christian) and which modified and added numerous elements which really makes it its own tradition.
Dion Fortune did not actually stay with the Golden Dawn very long but was more drawn to Theosophical thought so she is a good source for people with that leaning.
I also highly recommend the works of Manly P. Hall. The five chapters on Qabalah in his book 'The Secret Teachings of All Ages' are an excellent snapshot. This is the first chapter with the next four coming after it. The whole book itself is a goldmine of interesting ideas, I would definitely recommend taking a browse through its index.
http://www.sacred-texts.com/eso/sta/sta27.htm
http://www.innerlight.org.uk/
http://www.lvx.org/about.html
Middle Pillar was a ritual of the Stella Matutina and Regardie recommended it only be done with supervision. It can indeed be very powerful. The Stella Matutina and the Alpha et Omega were the two temples which emerged out of the dissolution of the original Order of the Golden Dawn. The Alpha et Omega continued in the traditional manner under the guidance of Mathers while the Stella Matutina was formed by Dr. Robert Felkin (who was a very strong Christian) and which modified and added numerous elements which really makes it its own tradition.
Dion Fortune did not actually stay with the Golden Dawn very long but was more drawn to Theosophical thought so she is a good source for people with that leaning.
I also highly recommend the works of Manly P. Hall. The five chapters on Qabalah in his book 'The Secret Teachings of All Ages' are an excellent snapshot. This is the first chapter with the next four coming after it. The whole book itself is a goldmine of interesting ideas, I would definitely recommend taking a browse through its index.
http://www.sacred-texts.com/eso/sta/sta27.htm