The hauntmeisters over at Terror Syndicate have put up their web page with a photo tour of their Dark Works haunt for 2005. As is usual for the guys who came up with Monster Mud, their haunt has a uniquely interesting look and a crazy level of attention to detail. These guys make a haunt that looks better than most pro haunts.
If you're interested in reproducing some of their effects, they have a long line of haunt products that they make themselves and sell. They sell foam skulls and other nasty props, and also have a line of books that have detailed instructions on prop building. While the production values on the books are pretty low (photocopied pages bound with plastic rings), and the price is a little steep, the books are high on content, and better than the published books you can find at Amazon. These guys know what they're doing, and have some of the best-looking corpses in the industry.