Skinny Puppy's (12" Anthology) has got some of the more creepy music I've heard. Particularly the songs "Deep Down Trauma HounRAB" , "Chainsaw", and "Adiction". The whole way Skinny Puppy composes thier music, with all the sample layers and dark industrial feel just brings a hole new meening to the terror core theme.
Also "Laughing Pain" by Front Line Assembly is good.
However the German band And One and it's two songs from the 9.9.99 CD "Prey" and "Men in Uniform" are definatly something many of you should check out if you are into anything remotely like synth pop.