Strange books about fortean adventures around the world.
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 wiki full of weird stuff, conspiracy theories, and strange happenings to inspire scenarios in your tabletop or live-action RPG.
The C'thulhu Mythos in the modern day (kinda). UFOs, the paranormal, and a horse doctor's dose of government black ops.
Declassified files pertaining to Project STARGATE.
A daily weblog of the weird, mysterious, occult, and strange, with links all over the place.