So this is the 2011 Audio Book Challenge set up over at Teresa's Reading Corner. The challenge runs throughout this year (Jan-Dec 2011). You can read more about it and sign up here and here.
There are four levels of the challenge to choose from:
Curious: 3 books
Fascinated: 6 books
Addicted: 12 books
Obsessed: 20 books
I am going to try for the "Fascinated" level, since I don't know how much I will like them, and because I think 6 books is a better challenge number than 3. We'll see!