Audible and Apple will continue to support each other. According to iPodNN,
The initial agreement was due to expire in September of 2007, but the extension announced today makes Audible the exclusive supplier of afore mentioned content until September of 2010
This is important news because, simply, it validates Audible’s technology as the one to beat until 2010 (at the very least).
You can do some pretty strategic planning if you know the spoken word format of choice for the next 4 years – think about it.