have you listened to the rppr horror episodes where we talk about how to run a horror game?
Oh yeah, and it's a definite leg up, I just didn't think it was appropriate to run a CoC game without reading the fiction on which the game is based. Not to mention, any place you can pull ideas, derive inspiration for NPC's, and just figuring out how to word things for the biggest suspense a help. Figured lovecraft was the man as far as that goes. I honestly haven't read a lot of horror, (with the exception of
House of Leaves by Mark Z. Danielewski) and was just gathering ideas.
I tend to put a lot of research into games, (reading novels, going on movie binges, etc.) when I'm getting ready to sit down and start writing out a campaign, most of the time I'm just going for a certain feel, and it just helps keep me on point.