Occult Lore is a great book. While a couple of the things are sorta hit-or-miss (Elementalism and Rational Magic come to mind), the majority of it is truely original*, and it's a book that anyone who likes using new magic styles should grab in a hearbeat.
*Very little of it is actualy original in the sense of "never heard of before"... in fact, most of it actualy plays off existing concepts. Astrology, Sympathetic Magic, Onieromancy, Alchemy (In the old, slightly-goofy sense, not in the stuff you can do with a feat), etc etc. But they are all well done and original for the D20 system.