Over at the Huffington Post, Christina Larmer makes the case for all readers to leave reviews if they want to support the authors they love:
If you can find a minute—and that’s all it takes, I promise you—please jot a quick review on whatever eRetailer you happen to have used, each and every time you finish a book. It doesn’t have to be my book, it doesn’t even have to be positive. Simply write a sentence or two about what you liked or didn’t like and give it a star rating.