Red Tomax's Site contains a lot of the information available from the game, including much that isn't really easy to find or notice on a normal run through. It's not all-inclusive, but it's not a bad place to start. Also has info tabs on most enemy groups, too, if you need that.
Beyond that, there's Web of Arachnos, which contains some background information, and according to Troy_Hickman, there's a CoH bible somewhere (likely where we mortals can't get our grubby fingers on it).
Beyond that? You're free to go with whatever you can make up.
So. I'm trying to find general knowledge of the beings of CoH/CoV. I've read over both of the websites, I look at the info on most monsters in game.. I just feel like there is alot of stuff that I don't know..
Is there any website or source that gives a good accounting of creature lore or just lore in general?