You have just published your first book and it has been hard. A whole 9 months of your life has been dedicated to writing that book and you want to make sure that you get the best out of it. What you want is to track its sales, know what your readers think about the book, and tie it in with your existing website. You also want to allow readers to directly buy the book off your website but you don't want to spend the next 9 months of your life writing an application to do this! What you're looking for is a mashup between your website and an online book seller like Amazon.com.