Prediction #1 (made September 2, 2005): Power Girl is the Earth-2 version of Supergirl, who managed to stick around even after the Crisis. The Psycho-Pirate kept her around deliberately, and is using her to restore the Multiverse.
Resolution: The first sentence is inarguably correct. As for the second, well, we still don't know why or how she managed to stick around, but it's clear that the Psycho-Pirate knew what was going on from the start. I'm giving myself full credit for this one.
Prediction #2 (made September 9, 2005): Someone, possibly the Anti-Monitor, is returning to finish off what he started and failed to do twenty years ago.
Resolution: I was partly wrong on this one. It wasn't the Anti-Monitor who came back, it was Alexander Luthor-3. However, if one argues that twenty years ago Luthor meant to save the universe, and he feels that he had failed...ah, I'm giving myself full credit for this one as well.
Prediction #3 (made September 16, 2005): The mysterious Mockingbird is actually Lena Luthor, merged with Brainiac 2.5.
How it stands: Well, I was apparently wrong on this one. Lena is nowhere to be found.
Resolution: Well, I was wrong, but as I did before, I give myself half-credit for predicting that it was a Luthor.
Prediction #4 (made September 23, 2005): Lex Luthor is behind everything, planning to restore the Multiverse.
Resolution: Aha! I never said which Lex Luthor, did I? Bwa-ha-ha! And during the course of the miniseries, he did have to restore the Multiverse...even if it was only an intervening step I give myself full marks on this one.
Prediction #5 (made September 30, 2005): The villain behind the new Crisis will turn out to be the original, Golden Age Superman, of Earth-2. (Clue: the JLA transporter incident in JLA #119.)
Resolution: Well, he wasn't a villain, and he wasn't the guy in JLA #119, but still...half credit, okay?
Prediction #6 (made October 10, 2005): Heroes will find themselves on opposite sides during the Crisis, because some will want to restore the Multiverse and others will not, as it will mean the destruction of the current universe.
Resolution: I suppose it might hinge on the definition of hero. Still, since Kal-L did want Earth-2 back, and he knew it would lead to the destruction of the current universe...full credit.
So in the end, I give myself a score of 83%.