Ooh, timely and helpful.
I'm sure I'll start with volume 1 for everything I want to read, but it's still good to know when I'll finally be past the events I already know about. For example, with Baccano I'll have to wait until volume 4, although I can already see some of the chronology differences between the novels and the TV series. For example, in the book the panhandler scene happens prior to Firo drinking the wine. In the anime, that scene had to have happened after he drank the wine, or his fingers would definitely have been a loss.