How many of you know about this beta site where you can track your sales? It's in real time, so when you go there, you will see where you are on Amazon at the moment, and once you plug your book in, it will keep a historical ranking, showing you your averages, highs, and lows. And you can compare your book to others (see how you are holding out against Atmospheric Disturbances, for example!).
This is just in case any of you need something to fill your time with while you are suffering from "writer's block." I apologize in advance.