Aleister Crowley, Thelema, Hermetic, Research reading

Thelemapedia, The Encyclopedia
of Thelema & Magick
The free, online encyclopedia of all things Thelema. Sponsored by the Lodge, but open to everyone.

The Invisible Basilica 
The homepage of Sabazius X°, the O.T.O. U.S. Grand Master

The Magick & Mysticism of Bill Heidrick
Essays by an important figure in O.T.O.

The Libri of Aleister Crowley
Many online works by Aleister Crowey

The A.'.A.'.
A teaching and initiatory structure dedicated to the personal spiritual advancement of its individual members

Hermetic.com
The hermetic library and root page for Sabazius, Bill Heidrick, T Polyphilus, and a few others of great interest

LAShTAL.com
A non-commercial site devoted to Thelema in culture and media, Thelemic philosophy and to the life and works of Aleister Crowley

International O.T.O.

International Headquarters
Australia Grand Lodge
U.K. Grand Lodge

Where the two companies I found, one is in Australia and one in UK.