Michele and I love Audible. We buys stacks of audio books from them. The interface is intuitive, they have good bargains, and if you are clever (like my wife is) you can time your purchases for maximum buying power (look into how they do their credit system – trust me, you can save a lot).
So, I'm pleased on one hand to hear that they have been bought by Amazon (another of my favourite online retailers). On the other, I just hope they don't change anything. Audible is great how it is. I'm happy for it to be improved further, but please don't clutter up their interface (or even worse – change their credit system).