The homepage of Grant Morrison.
An online bookstore catering to all things occult and all paths. Especially interesting for its selection of left-hand path texts. A good site that brings lots of different books together so you can find the non-mainstream texts out there.
A full archive of all of Genesis P. Orridge's writings and material, dating from before the era of ToPY up until the present day. The header includes a number of links to the archives (one per topic, broadly speaking).
An online sigil generator.