what's with all the old forums being dug up lately? also, shaman didn't say they were cursing people, just that they wanted to learn so the guilt trip really isn't needed, it's good to note, but not necessary.
i don't know of any myself because most people feel it's a bad thing to learn because black magick is evil whoooo [sarcasm] but it's knowledge, so i don't see why one can't research it. i have yet to find a book of curses or demonic magic, have found a book on demonology, and the necronomicon, but nothing on negative magic studies. but there's probably plenty of articles out there on the subject. myself i have a spell book consisting of hexes and curses i've acquired over the years, that's the closest i've come to any actual book on the subject.