Click on GET YOUR VOUCHER (if you get an error just hit F5 to reload the page)
You will then be prompted to sign into your Amazon account or you can create a new account
Your $5 credit will appear immediately in your account
Available to the first 100,000 people to claim this offer.
Offer expires on 26/08/2013
The coupon is valid for audio content only (on audible.com) and will expire if not used within 90 days
Whilst the T&Cs say it's only available to customers in the US it worked fine on my existing Amazon account. There are quite a few titles you can pick up for free using your $5 coupon.
hmm cool not sure how much use it'll be as I don't know if any of the books are under $5.00 but also interesting that I didn't need to even make an audible account to get the $5 card. hope this didn't ruin my chance of signing up with an affiliate link for two free books though.