Calibre,
Have to add my congratulations as well; I shudder to think of going back to using Sony Reader for PC as well as nook and Kobo's "management" systems.
. It's wonderful to be able to use calibre for all three (four if you include my Sony 505 that I loan out to my Dad) of my readers. Yes, I'm one of those' multiple reader owners!
Thank you Kovid!