Writing Final Crisis in novel format had to have been a bitch.
As far as books go I really, really enjoyed No Man's Land. I thought it was quite spectacular. I met Greg Rucka once and he agreed that it was one of his better books.
Greg Rucka was very helpful when I was writing "52." He let me pick his brain for about an hour regarding the Batwoman subplot . . . .
As for FINAL CRISIS . . . as usual, I had to simplify and streamline the plot a bit to adapt it to book form. But talk about a fun bunch of characters to play with: Frankenstein, evil Mary Marvel, Darkseid, the Green Lantern Corps . . . .