I've written about Audible before. It's a great audio book subscription service. Read more ...
HERE are the details of this current deal.
I think that a 30-day free trial for new subscribers is pretty standard, but 2 months for free (or a $10 credit for current subscribers) is a nice deal.
I use Audible a lot for listening to audio books via my iPhone on my commute.
Audible is owned by Amazon, so you can use your same log-in information for Audible and Amazon.