Look no further! One of the best and most organized places for a wide range of how-tos on the internet for building your own Halloween props is Haunt Project. I go there before any other place when I have something in mind to build, but want guidance for building it. Perfessor Evil has the site organized into categories for easy browsing. You can add your own projects as well. I have a few on there myself. In addition to projects, there are categories for vendors, media, comics, email lists, forums and groups. Perfessor's got a little of everything and a lot of props to learn how to make. Make sure to visit!!