Are you obsessed with your Amazon Sales Rank?

I came out with my first book recently (it's about inbound marketing).

The book has done well, and geek that I am, I've become obsessed with watching my Amazon Sales rank. Since I'm a developer, I decided to build a simple tool to help track how rankings move over time, and my book shows up as a suggestion on other well-selling books (what I call a "referral" book).

If you're obsessed about watching Amazon rankings like me, you might find my free tool useful:

http://Book.Grader.com (still in the very early stages, but useful).

Let me know what you think.