I've not pre-ordered one yet but I am almost (98%) sure I'll be getting a 900. I just have to see one and touch it and play with it for a little bit to make the final decision. And also it will be nice to see some peoples comments and reviews once they get theirs. Although I dont expect there to be any surprises given the consistently favorable comments on previous Sony readers.
I'm just hoping there is a store near me that has a demo model sometime in the next month!!
What book will be first? No idea, I've already spent several hours downloading Calibre, and a bunch of books from Baen and project Gutenberg, by the time I actually get a reader I should have well over 100