In iphone's ipod player (apps), there's a catagory call "audio books" and mp3 file in that catagory can play a mp3 file which can remember the last playing position, and next time when I open the ipod apps, it resume playing from the last stopped position. I have to add the file through iTune's media library, and change the media type from music to audio book, so the mp3 audio book file can have the resume function. Otherwise every mp3 file added to the media library are music file (and no resume function built-in) by default!! I hate to go through iTune just to change the property of the mp3 file, for all the pain iTune caused me in the past.