Right off the bat, visual design is great, theming is great. Perfect Appendix N material, and I LOVE the paperback book w/ yellow pages.
Great hook, nice map. Eight Screams of the Spider Cultists is an excellent table. It doesn't even need to be attached to Area 8, it could go right on the front page!
This is solid and goes right into the "I'd run it tonight" pile.
The "aftermath" section could get a little more love - I assume the one duplicitious cultist might have an escaping sister who plots revenge, perhaps an artifact might tie the party's mage to the spider-magics, etc.
Like spider eggs under the skin, what I want from this module is MORE MORE MORE!