Hi Sue, for audio files, I use my favorite video app, the Korean
AVPlayerHD ($3). It's awesome!
It includes a built-in HTTP (and also FTP) server. So, what you do, is you simply type in AVPlayerHD's IP address into any regular browser on your main computer, and then upload your audio (or video) files via WiFi directly to AVPlayerHD.
Inside AVPlayerHD, you can set up folders for sets of audio files so there's no confusion. AVPlayer is also available for the iPhone.
I don't really listen to audio-books, but I do listen to audio files regularly to assist my learning of foreign languages. I'm currently trying to learn French and Vietnamese.
What's so great about AVPlayerHD, is that it offers many multi-touch gestures that you can configure to your liking.
So, for example, you can specify that a single tap of your finger pauses the playback. A swipe of your finger to the left can rewind 5 seconds (or 10 seconds, or 30 seconds -- whatever you like). A swipe with 2 fingers downwards can slow down playback by 0.1 (where 1.0 is the normal speed). This is extremely useful when trying to learn foreign languages -- native speakers sometimes speak so fast I have trouble catching their words. But, slowing them down a bit really helps.
(Conversely, when watching boring movies, you can speed AVPlayerHD up, to get through the boredom faster!
Lately, I watched the Oscar-winner
Silver Linings Playbook that way, and I was so disappointed by the movie I was really grateful to AVPlayerHD for allowing me to get through it faster than normal!)
