Garage Of Evil includes a nice selection of How-To-Guides with Difficulty Rating

Monsterlist Collection of links to pages with do-it-yourself Halloween projects

AidtopiaSome more Halloween Projects only has 4

Haunt Warehouse More Project Ideas

ScareFX Halloween's Haunted Yards. 4 big projects very cool stuff

Instructables Collection of How-To guides for every thing

EPITAPHS Small Collection of Epitaphs

Got Fog Every thing you need to know about fog Machines

HalloweenEffects Blacklights, strobe lights and other Halloween props.