MyAnonaMouse (MAM) is a very large private tracker dedicated to audiobooks, ebooks, sheet music, and radio shows. There is a strict policy at MyAnonaMouse about no swear words, and no pornographic/erotic content.
Features:
MAM is known for having a very decent community. Its members are friendly, helpful, and very welcoming.
Maintaing a good ratio is easy, as you will receive a lot of bonus points once you join. Not just that, there're a lot of freeleech torrents. Better yet, once you become a power-user (after 4 weeks of being a member), you can purchase a VIP class (with the bonus points) that will give you access to a huge selection of VIP-only, freeleech torrents.
The content and the overall speed is also considered very good. It does have a fair amount of exclusives.