Nightly Crisis

So I went and joined the Science Fiction Book Club - the introductory package included 5 books for .50 each and a 6th book for free, so it seemed like a pretty good deal. I wouldn't have joined except for the fact that they carry graphic novels, trade paperbacks, and novels based on comic books. I was able to fulfil my commitment with my first order (only have to buy 2 books at regular club prices within a year) when I bought the novelization of Crisis on Infinite Earths, a Green Lantern novel and got a 3rd book, Queen of the Slayers - a story that takes place shortly after the closing of the Hellmouth at the end of the Buffy series - absolutely free!
I'm enjoying the club already.
I've already dived into Crisis and am about twelve chapters in. It's pretty good so far. I just had to find out what all the fuss was about with the whole Crisis storyline. It can get pretty confusing, what with all the multiple earths floating around out there in the multiverse. Earth 1, Earth 2, Earth 3, Earth D. I wonder if characters from these alternate earths ever take offense at being labeled such as that. Wouldn't they all consider their own Earth to be Earth 1? It's all a matter of perspective.