Lots of info about horror writing in general:
http://horror.fictionfactor.com/
Good starting points to both online and print publication:
http://horror.fictionfactor.com/epublishers.html
http://horror.fictionfactor.com/publishers.html
This is where i have been looking for years. havent had a thing published and only ever got one actual rejection letter, but it was nice to get a response.
Ironically, i am showing you of all people this. The one rejection letter i got was From Sci-Fi magazine for Father Dillon;s Funeral (Night of the Living Dead, more or less)
Yep, I got turned down by Sci-fi 3 tyears ago, dont I feel cool :)