Which ones? Any Demon? Or Changeling? ...how attached to these books are you?...some X:The Y White Wolf products that I don't remember buying sitting on my shelf waiting to get used.
Games I've played/run... I'll forget some, and anything at cons from back when I went I won't recall.
oWoD games Vampire, Dark Ages Vampire, Hunter, and... I thought there was something else? I have a few nWoD books, and I ran a homebrew game that featured skypirates and rules stolen from the books. 4e, and the 3.x stuff. SR current and last. Played a few home brew systems of friends. Munchkin, M:tG, etc. count for this?
I own some books, pdfs, etc. for games I've never played - and probably won't ever get around to it.