Author Christine Bell recently posted about her experiences using the sales rank of her books on Amazon and Barnes and Noble to get an idea of how well her book is selling. If you’re in a situation where you don’t have access to real-time sales figures, this could be a useful tool for the reasons the author outlines, including deciding if a book needs more promotion, estimating earnings, and getting an advance idea about what your royalty statement might bring, at least for these outlets.
Thanks to Nicola Marsh for tweeting the link!