I'm missing several of the Changeling: the Dreaming books from the end of that line's run, but there was a marked sort of decline in product, so I don't mind so much. This book, though, I've heard nothing but good things about. Scuttlebutt is that it is one of the hardest White Wolf books to get.
Le Code Voynich ISBN 2350130223 (2005)
The French facsimile of the entire Voynich Manuscript. What more can be said about that? Other than, you know, somehow the book market isn't hip to global commerce. Anyhow, you can imagine that this book is filled with gorgeous weirdness, & I'm pretty sure if I got my grubby little mitts on it, I could totally decipher all kinds of alchemical secrets.
Codex Seraphinianus ISBN 8817013897 (2006)
I guess those Italians are in on it too, because this was just released late late year. Really, I'm not picky about which edition, I just think this is probably the most likely one to get. Jenny actually got me one of the editions (I should have noted which one) from the library for a little while, & it sure was keen. Goofier than the Voynich Manuscript, but a classy imitator, none the less.