At the moment I'm reading Slavinski's 'Psychonauts of Inner Worlds'.
I will try to get my hands on the rest of his books after this one, as I really like his style and the way he puts contemporary ocultism in modern scientific/psychological perspective.
I don't think his books have been translated to English tho, apart from the latest two - Return to oneness and 'PEAT' (Primordial Energy Activation and Transcendence) and the Neutralization of Polarities.
But I also must mention my guilty pleasure pastime -
fanfiction.net - galore of untold stories, non-canon shippings and what-ifs on your favorite books, anime, tv-shows and games.