It's from the soundtrack to the movie Bram Stoker's Dracula. I have the cd somewhere if you want me to look up the exact title and the name of the russian sounding composer
Brad Demoss did a VH:D bloodlust video to it last year.
heh, finally watching the whole trailer I see you should have probably specified which song.. there's at least 3. DO you mean the very very first one, or the pop track at the end or the stuff in the middle?
I'm not sure which trailer you're referring to, 'cuz I haven't seen them... but I did hear one on the radio the other day. Finch's "Worms of the Earth" was used in the radio trailer (they also just recently shot a video for it, surprisingly enough, which has some movie footage in it).