www.CthulhuLive.com -- Primary site for Cthulhu live: Some good resources - not updated too often.
PST Productions -- Very Active in Cons and such - We worked together (with Mac, as well) to create and run The John Dean Necronomicon, Version 2.0 at NecronomiCon in Providence in 2001. They're good folk.
The H.P. Lovecraft Historical Society -- These guys are Awesome! And by 'awesome', I mean 'totally sweet!' I got to play Dead Nazi Numbers 1, 5, 7, and 11 with Sean or Andrew (I suck) at NecronomiCon 2001. They also helped walk me through my first Live Action Cthulhu story: Approach of the Deamon. Also responsible for Shoggoth on the Roof. I mean it, 'totally sweet!'
Propping Up the Mythos -- Quite possibly the penultimate website for Cthulhu Live Prop ideas and directions.
Player Resources and Stuff
Realistic Toy Guns -- Generally speaking, the rifles and automatic weapons are smaller than their real-life counterparts, but the handguns look great.
Delta Green -- Shadowy Government Conspiracies, MIB, who the fuck are these guys who show up in so many stories? This site provides a pretty good introduction.
The H.P. Lovecraft Archive -- Very nice informational site on my man, H.P.
Paranormal and Weird Sites
Minnesota Paranormal Investigative Group -- Featuring one of the most annoying graphic gimmicks I've ever seen on the side of the page, it does have some vaguely interesting information
Haunted America Links -- Another site of marginal direct interest but it does have some neat tidbits and potential ideas
Weird Wisconsin -- They eat too much cheese, they're right next door, and some of them are scary as hell
Weird New Jersey -- Why doesn't Minnesota have one of these sites?
The Shadowlands -- A lot of the formatting and layout here reminds me of a porn site... not that I've ever been to one, mind you
The Bible Prophesy Home Page -- Has some fun stuff
E-Texts and Resources
Bibliotecha Arcana -- Lots of good stuff
Alchemical Texts -- Back to the 16th Century - Primarily English
Medieval Sourcebook -- Lots of stuff
Internet Sacred Text Archive -- Some good stuff in here
Electronic Text Service -- Through Columbia University, arranged by language or subject
Encyclopedia Mythica -- An encyclopedia of mythology, folklore, and legend
Medieval Woodcuts -- Add some spice to your ancient tome of forbidden lore
Fontifier -- Create your own fonts
Other
Terraserver -- While also a good source for creating satellite survaillance photos, we use this site a lot when we're trying to find good out of the way places for our games.
General Pathology -- Good source for images included in certain police files
Incidentaly...
www.NoGoodDeed.com -- Well, the site seems to have disappeared, but I'm leaving the link in case it comes back. It was one of the most awful things I've ever seen in my life!
Friends of No Good Deed Productions
Black Argent --Some really nice photography, all done by friends who are/have been cast and crew of No Good Deed Productions events.
Rick Holton's New Web Page --My Pa has a website and this is it. (This is the old site that I sucked too much to link to)
The Official Ninja Webpage: REAL Ultimate Power!!!! -- Ok, no actual contact or affiliation of any kind, but this guy cracks me up and I can't pimp his website enough!