The field of quantum noise in mesoscopic physics has experienced intensive development for more than a decade, and there is as yet no sign of a slow-down. This book presents a collection of reviews in which the leading research teams summarize their most recent results and chart new directions. Taken together, the reviews give a snapshot of the modern state of the field, which is not yet coherent. The book thus presents different approaches and conflicting views, as well as contradictory results and interpretations. The book is divided into three parts, according to the three main research streams: shot noise, quantum measurement and entanglement, and full counting statistics.