Howdy! This is the *real* me, so I think I can answer this one...
There is only ONE version of the book by Bert and I, and it is the one for the 1.4 exam (which includes the programmer and developer exams). The reason you sometimes see references to it with just *my* name and not Bert's, is because that's how they made samples of the cover to advertise *before* the book was actually finished. Don't ask me why... but regardless of whether you see a cover with just my name or with both our names -- IT IS THE SAME BOOK!
There IS no other version, so if my name is on it *anywhere*, then it is the one and only book. We have different *printings*, of course, but no different editions.
So the mystery is solved... whenever you see the cover with just my name on it, it means they are running a really old version of the cover -- a cover that was never on any actual books, but was just used in early ads and some book sellers obviously never changed it. There are always strange mistakes that show up in some book stores, but you don't have to worry about getting a different version of the book.
There *will* be an updated edition for Tiger, but that is not for a looooong time from now.
cheers,
Kathy