This is not meant to be an all-inclusive list. Just some sites I dragged out of my old database or wandered around and found tonight. Meanwhile my puppies are being hyper so I have to stop working and put them to bed in their crates!
California Haunted Houses - Commercial haunts, as well as spook walks and hay rides, etc.
DFW Haunted Houses.com - Dallas, Fort Worth haunted houses, including haunt reviews.
Florida Haunted Houses.com - A cookie cutter website, but has good info nonetheless on Halloween 2010 attractions all over the state of Florida.
Haunted Bay - Bay Area Halloween concerts, haunted houses, Halloween events, and some downloads and forums.
Haunted Cincinnati - Cincinnati, Ohio haunt reviews and news.
Haunted Duluth - Duluth, Minnesota Halloween haunts.
Haunted Happenings - Salem, Massachusetts ("The Witch City") Halloween activities.
Haunted Hudson Valley - New York State's Hudson Valley region Halloween and haunted activities.
Haunted Illinois.com - Illinois haunt listings.
Haunted Mid South - Memphis, Florida area Halloween haunts, home haunts, and haunted trails.
Haunted Night.com - Haunted house listings for Seattle, Portland, Boise, and Vancouver Canada.
Haunted Wisconsin - Haunt and pumpkin patch listings, plus a neighborhood trick-or-treat list.
Hollywood Gothique - Los Angeles area Halloween, horror, and sci-fi events and activities.
Horror in the Hammer - Hamilton, Ontario horror, Halloween and zombie events.
Long Island Haunted Houses - Plus hayrides, corn mazes, spook walks, home haunts and events.
Nola.Com - New Orleans haunted Halloween happenings, news and blog posts.
Ohio's Haunted.com - They also cover Kentucky and Indiana.
Ohio Valley Haunts - Haunt reviews, not just listings.
Scared.com - Denver, Colorado area haunted houses and Halloween events. Plus some info on zombie crawls.
Scary Ohio - Ohio's haunted houses, Halloween attractions and events.