Do you not think it would be good to have a Theosophy portal on Wikipedia so it can go in the main portal under religion? (where most Philosophy editors would probably prefer it be.) That is just one thing about Theosophy and the net; I guess more can be discussed here. Actually I have just edited this post and added all the sites below.
Quabalah
http://www.workofthechariot.com is an interesting interfaith Quabalah site that has some Trees of Life based on Revelation's '7 seals' so the trees are more like the chakra system. It has much other interesting topics also, in a book that can be downloaded, though one chapter has no link--you can type its number in an obvious pdf name in a URL to download it.
Other Quabalah-related sites are
http://www.essene.com/ and
http://www.thenazarenway.com, some of the only interfaith Essene sites that have many good translations of texts including of other religions.
http://www.spiritweb.com/ was an interesting site (still available in
http://www.archive.org/) that may have been spirit[ual]ist because it had much channeling info, but they have many other spiritual texts, FAQs, art.
http://www.spiritweb.us/ is trying to replace it.
http://www.agniyoga.org/ is a site about the works of Helena Roerich, which seems Theosophy-influenced. It disagrees with some ideas, but there is also some interesting info.
http://www.wisdomimpressions.com/ is a site about the works of Lucille Cedercrans, which is likely in agreement with Theosophy.
Ascended Masters
There were 2 or 3 groups that focused o'n the Ascended Masters,' but my favourite is
http://www.theascendedmasters.com/. It is just an art site but has a link to an interesting book by Murdo MacDonald-Bayne who wrote books like
Beyond The Himalayas and
The Yoga of The Christ giving accounts of his trip there and to Tibet. One day someone just appeared at the artist's door and gave her the former book, and that person or another also came to her house to specifically ask about her art and spread it.