If you want to tidy up once and for all, this is the best kick in the pants you can get for ten bucks. This book is more than a little woo-woo, but her extreme approach to decluttering WORKS. Kondo is a Japanese personal tidying expert (she doesn’t like to call herself an “organizer”). She originally wrote her decluttering manifesto to help the Japanese clients languishing on her waiting list. Not all translations are good translations, but this one has been praised for preserving the quirkiness of her voice. (It's quirky, all right.) I love this book (more thoughts on that here).