Not sure how useful the Voynich Manuscript would be given that no one can read it. It's nifty, sure, but not terribly helpful.
Plus many of these seem to grimoires, so useful for someone looking to get into high ritual magic, but not so much for someone doing something less ritual.
I kind of dig Judika Illes' Encyclopedia of 5000 Spells, it has a bit of a bad habit of listing correspondences as spells on their own and it's a little light on explanations for a number of things, but it's a good started book if you have the understanding that you'll want to do your own research as well.
Penczak's City Magic is pretty good too, especially if you're just starting out or just moved from the country to a city. It has something of a Wiccan bent,most of his books do, but that can be worked around pretty easily.