From the web site:
Welcome to Audible.com's Summer FREE Audiobook Giveaway! We're offering some of the season's top titles, along with a number of our best-sellers, absolutely free with no strings attached. This is your best opportunity to try an audiobook absolutely free and kick-start your summer with a great book. Choose 1 FREE audiobook on us. There is no credit card required to participate. This event ends July 2, 2010, at 11:59 PM EST.The link is here. Thanks to Jennifer on MyOutlanderPurgatory for the tip!
If you haven't listened to the UNABRIDGED audiobooks read by Davina Porter, I highly recommend them. And it's free, so what are you waiting for? <g> This is a perfect opportunity, if you act fast.
For more information about OUTLANDER audiobooks in general, look here. There's a YouTube interview with Davina Porter here.