Heard any good books lately? Apparently, lots of people are listening. According to a survey conducted by the Audio Publishers Association, annual audiobook sales are now estimated at $923 million. Customers find books at libraries, retail stores, and through downloading, which is becoming the fastest-growing audiobook format. This article presents 2007's "best" list which includes titles by the late Octavia Butler, best-selling authors Khaled Hosseini and Nora Roberts, Harvard professor Henry Louis Gates, and "Good Morning America" coanchor Robin Roberts.