I have moved on from Amazon rankings. Worldcat is my new obsession.
Worldcat (http://www.worldcat.org) is a website that connects you to more than 10,000 libraries. If you type in the name of your book, you can see what library systems your book is in and even its availability at a particular library.
Since the publication of my novel, I have become a Worldcat devotee, watching as my book slowly makes its way into library systems across the country. I love seeing that my novel is checked out in places I've never been. Like Missoula. Or Kokomo. Or places I've always wanted to go. Like Missoula. And Kokomo.
Of course there is much more to Worldcat than checking on your own book. Someday I may find out what.