Horror

The Company of Crimson
Campaign information for a gothic horror LARP set in Victorian England
http://www.geocities.com/companyofcrimson/

Fear of the Dark
Specializes in organising and running horror and murder/mystery events. All events are catered and insurance is included. Located in the United Kingdom.
http://www.fotd.findingviews.com/

In Nomine LARP
Austin, Texas game based on Steve Jackson Games' tabletop game of angel/demon conflicts.
http://members.aol.com/sumitr/

Midnight's Children: Dark Theatres of the Mind
A post-apocalyptic supernatural LARP set in California, but played in Toledo, Ohio.
http://www.geocities.com/TimesSquare/Lair/8263/

Subterranean Homesick Games
Authors of live action games, in the interactive literature style. Site contains information on each of the stories they have created.
http://www.unseelie.org/shg/