LostKnightsRPG.org

So, there's not a general oWoD forum or anything, but here's a list of almost, but not quite all, discipline powers, thaum paths and rituals compiled by some guy with too much time on his hands:

http://forum.rpg.net/showthread.php?t=144257

Note that this is for old Vampire and is primarily Dark Ages (both Vampire: The Dark Ages and Dark Ages: Vampire), and 3rd Ed/Revised.